RCSB PDB: Data API Documentation

  • Entry Attributes
  • Assembly Attributes
  • Polymer Entity Attributes
  • Branched Entity Attributes
  • Non-polymer Entity Attributes
  • Polymer Instance Attributes
  • Branched Instance Attributes
  • Non-polymer Instance Attributes
  • Chemical Component Attributes
  • UniProt Attributes
  • PubMed Attributes
  • DrugBank Attributes
  • Entry Attributes

    Attribute Description
    audit_author.identifier_ORCIDThe Open Researcher and Contributor ID (ORCID).
    audit_author.nameThe name of an author of this data block. If there are multiple
    authors, _audit_author.name is looped with _audit_author.address.
    The family name(s), followed by a comma and including any
    dynastic components, precedes the first name(s) or initial(s).
    audit_author.pdbx_ordinalThis data item defines the order of the author's name in the
    list of audit authors.
    cell.Z_PDBThe number of the polymeric chains in a unit cell. In the case
    of heteropolymers, Z is the number of occurrences of the most
    populous chain.

    This data item is provided for compatibility with the original
    Protein Data Bank format, and only for that purpose.
    cell.angle_alphaUnit-cell angle alpha of the reported structure in degrees.
    cell.angle_betaUnit-cell angle beta of the reported structure in degrees.
    cell.angle_gammaUnit-cell angle gamma of the reported structure in degrees.
    cell.formula_units_ZThe number of the formula units in the unit cell as specified
    by _chemical_formula.structural, _chemical_formula.moiety or
    _chemical_formula.sum.
    cell.length_aUnit-cell length a corresponding to the structure reported in
    angstroms.
    cell.length_bUnit-cell length b corresponding to the structure reported in
    angstroms.
    cell.length_cUnit-cell length c corresponding to the structure reported in
    angstroms.
    cell.pdbx_unique_axisTo further identify unique axis if necessary. E.g., P 21 with
    an unique C axis will have 'C' in this field.
    cell.volumeCell volume V in angstroms cubed.

    V = a b c (1 - cos^2^~alpha~ - cos^2^~beta~ - cos^2^~gamma~
    + 2 cos~alpha~ cos~beta~ cos~gamma~)^1/2^

    a = _cell.length_a
    b = _cell.length_b
    c = _cell.length_c
    alpha = _cell.angle_alpha
    beta = _cell.angle_beta
    gamma = _cell.angle_gamma
    citation.book_id_ISBNThe International Standard Book Number (ISBN) code assigned to
    the book cited; relevant for books or book chapters.
    citation.book_publisherThe name of the publisher of the citation; relevant
    for books or book chapters.
    citation.book_publisher_cityThe location of the publisher of the citation; relevant
    for books or book chapters.
    citation.book_titleThe title of the book in which the citation appeared; relevant
    for books or book chapters.
    citation.coordinate_linkage_citation.coordinate_linkage states whether this citation
    is concerned with precisely the set of coordinates given in the
    data block. If, for instance, the publication described the same
    structure, but the coordinates had undergone further refinement
    prior to the creation of the data block, the value of this data
    item would be 'no'.
    citation.countryThe country/region of publication; relevant for books
    and book chapters.
    citation.idThe value of _citation.id must uniquely identify a record in the
    CITATION list.

    The _citation.id 'primary' should be used to indicate the
    citation that the author(s) consider to be the most pertinent to
    the contents of the data block.

    Note that this item need not be a number; it can be any unique
    identifier.
    citation.journal_abbrevAbbreviated name of the cited journal as given in the
    Chemical Abstracts Service Source Index.
    citation.journal_fullFull name of the cited journal; relevant for journal articles.
    citation.journal_id_ASTMThe American Society for Testing and Materials (ASTM) code
    assigned to the journal cited (also referred to as the CODEN
    designator of the Chemical Abstracts Service); relevant for
    journal articles.
    citation.journal_id_CSDThe Cambridge Structural Database (CSD) code assigned to the
    journal cited; relevant for journal articles. This is also the
    system used at the Protein Data Bank (PDB).
    citation.journal_id_ISSNThe International Standard Serial Number (ISSN) code assigned to
    the journal cited; relevant for journal articles.
    citation.journal_issueIssue number of the journal cited; relevant for journal
    articles.
    citation.journal_volumeVolume number of the journal cited; relevant for journal
    articles.
    citation.languageLanguage in which the cited article is written.
    citation.page_firstThe first page of the citation; relevant for journal
    articles, books and book chapters.
    citation.page_lastThe last page of the citation; relevant for journal
    articles, books and book chapters.
    citation.pdbx_database_id_DOIDocument Object Identifier used by doi.org to uniquely
    specify bibliographic entry.
    citation.pdbx_database_id_PubMedAscession number used by PubMed to categorize a specific
    bibliographic entry.
    citation.rcsb_authorsNames of the authors of the citation; relevant for journal
    articles, books and book chapters. Names are separated by vertical bars.

    The family name(s), followed by a comma and including any
    dynastic components, precedes the first name(s) or initial(s).
    citation.rcsb_is_primaryFlag to indicate a primary citation.
    citation.rcsb_journal_abbrevNormalized journal abbreviation.
    citation.titleThe title of the citation; relevant for journal articles, books
    and book chapters.
    citation.unpublished_flagFlag to indicate that this citation will not be published.
    citation.yearThe year of the citation; relevant for journal articles, books
    and book chapters.
    diffrn.ambient_pressureThe mean hydrostatic pressure in kilopascals at which the
    intensities were measured.
    diffrn.ambient_tempThe mean temperature in kelvins at which the intensities were
    measured.
    diffrn.ambient_temp_detailsA description of special aspects of temperature control during
    data collection.
    diffrn.crystal_idThis data item is a pointer to _exptl_crystal.id in the
    EXPTL_CRYSTAL category.
    diffrn.crystal_supportThe physical device used to support the crystal during data
    collection.
    diffrn.detailsSpecial details of the diffraction measurement process. Should
    include information about source instability, crystal motion,
    degradation and so on.
    diffrn.idThis data item uniquely identifies a set of diffraction
    data.
    diffrn.pdbx_serial_crystal_experimentY/N if using serial crystallography experiment in which multiple crystals contribute to each diffraction frame in the experiment.
    diffrn_detector.detailsA description of special aspects of the radiation detector.
    diffrn_detector.detectorThe general class of the radiation detector.
    diffrn_detector.diffrn_idThis data item is a pointer to _diffrn.id in the DIFFRN
    category.
    diffrn_detector.pdbx_collection_dateThe date of data collection.
    diffrn_detector.pdbx_frequencyThe operating frequency of the detector (Hz) used in data collection.
    diffrn_detector.typeThe make, model or name of the detector device used.
    diffrn_radiation.collimationThe collimation or focusing applied to the radiation.
    diffrn_radiation.diffrn_idThis data item is a pointer to _diffrn.id in the DIFFRN
    category.
    diffrn_radiation.monochromatorThe method used to obtain monochromatic radiation. If a mono-
    chromator crystal is used, the material and the indices of the
    Bragg reflection are specified.
    diffrn_radiation.pdbx_diffrn_protocolSINGLE WAVELENGTH, LAUE, or MAD.
    diffrn_radiation.pdbx_monochromatic_or_laue_m_lMonochromatic or Laue.
    diffrn_radiation.pdbx_scattering_typeThe radiation scattering type for this diffraction data set.
    diffrn_radiation.pdbx_wavelengthWavelength of radiation.
    diffrn_radiation.pdbx_wavelength_listComma separated list of wavelengths or wavelength range.
    diffrn_radiation.typeThe nature of the radiation. This is typically a description
    of the X-ray wavelength in Siegbahn notation.
    diffrn_radiation.wavelength_idThis data item is a pointer to _diffrn_radiation_wavelength.id
    in the DIFFRN_RADIATION_WAVELENGTH category.
    diffrn_source.detailsA description of special aspects of the radiation source used.
    diffrn_source.diffrn_idThis data item is a pointer to _diffrn.id in the DIFFRN
    category.
    diffrn_source.pdbx_synchrotron_beamlineSynchrotron beamline.
    diffrn_source.pdbx_synchrotron_siteSynchrotron site.
    diffrn_source.pdbx_wavelengthWavelength of radiation.
    diffrn_source.pdbx_wavelength_listComma separated list of wavelengths or wavelength range.
    diffrn_source.sourceThe general class of the radiation source.
    diffrn_source.typeThe make, model or name of the source of radiation.
    em_2d_crystal_entity.angle_gammaUnit-cell angle gamma in degrees.
    em_2d_crystal_entity.c_sampling_lengthLength used to sample the reciprocal lattice lines in the c-direction.
    em_2d_crystal_entity.idPRIMARY KEY
    em_2d_crystal_entity.image_processing_idpointer to _em_image_processing.id in the EM_IMAGE_PROCESSING category.
    em_2d_crystal_entity.length_aUnit-cell length a in angstroms.
    em_2d_crystal_entity.length_bUnit-cell length b in angstroms.
    em_2d_crystal_entity.length_cThickness of 2D crystal
    em_2d_crystal_entity.space_group_name_H_MThere are 17 plane groups classified as oblique, rectangular, square, and hexagonal.
    To describe the symmetry of 2D crystals of biological molecules,
    plane groups are expanded to equivalent noncentrosymmetric space groups.
    The 2D crystal plane corresponds to the 'ab' plane of the space group.

    Enumerated space group descriptions include the plane group number in parentheses,
    the H-M plane group symbol, and the plane group class.
    em_3d_crystal_entity.angle_alphaUnit-cell angle alpha in degrees.
    em_3d_crystal_entity.angle_betaUnit-cell angle beta in degrees.
    em_3d_crystal_entity.angle_gammaUnit-cell angle gamma in degrees.
    em_3d_crystal_entity.idPRIMARY KEY
    em_3d_crystal_entity.image_processing_idpointer to _em_image_processing.id in the EM_IMAGE_PROCESSING category.
    em_3d_crystal_entity.length_aUnit-cell length a in angstroms.
    em_3d_crystal_entity.length_bUnit-cell length b in angstroms.
    em_3d_crystal_entity.length_cUnit-cell length c in angstroms.
    em_3d_crystal_entity.space_group_nameSpace group name.
    em_3d_crystal_entity.space_group_numSpace group number.
    em_3d_fitting.detailsAny additional details regarding fitting of atomic coordinates into
    the 3DEM volume, including data and considerations from other
    methods used in computation of the model.
    em_3d_fitting.idThe value of _em_3d_fitting.id must uniquely identify
    a fitting procedure of atomic coordinates
    into 3dem reconstructed map volume.
    em_3d_fitting.methodThe method used to fit atomic coordinates
    into the 3dem reconstructed map.
    em_3d_fitting.overall_b_valueThe overall B (temperature factor) value for the 3d-em volume.
    em_3d_fitting.ref_protocolThe refinement protocol used.
    em_3d_fitting.ref_spaceA flag to indicate whether fitting was carried out in real
    or reciprocal refinement space.
    em_3d_fitting.target_criteriaThe measure used to assess quality of fit of the atomic coordinates in the
    3DEM map volume.
    em_3d_fitting_list.3d_fitting_idThe value of _em_3d_fitting_list.3d_fitting_id is a pointer
    to _em_3d_fitting.id in the 3d_fitting category
    em_3d_fitting_list.detailsDetails about the model used in fitting.
    em_3d_fitting_list.idPRIMARY KEY
    em_3d_fitting_list.pdb_chain_idThe ID of the biopolymer chain used for fitting, e.g., A. Please note that
    only one chain can be specified per instance. If all chains of a particular
    structure have been used for fitting, this field can be left blank.
    em_3d_fitting_list.pdb_chain_residue_rangeResidue range for the identified chain.
    em_3d_fitting_list.pdb_entry_idThe PDB code for the entry used in fitting.
    em_3d_reconstruction.actual_pixel_sizeThe actual pixel size of the projection set of images in Angstroms.
    em_3d_reconstruction.algorithmThe reconstruction algorithm/technique used to generate the map.
    em_3d_reconstruction.detailsAny additional details used in the 3d reconstruction.
    em_3d_reconstruction.idPRIMARY KEY
    em_3d_reconstruction.image_processing_idForeign key to the EM_IMAGE_PROCESSING category
    em_3d_reconstruction.magnification_calibrationThe magnification calibration method for the 3d reconstruction.
    em_3d_reconstruction.methodThe algorithm method used for the 3d-reconstruction.
    em_3d_reconstruction.nominal_pixel_sizeThe nominal pixel size of the projection set of images in Angstroms.
    em_3d_reconstruction.num_class_averagesThe number of classes used in the final 3d reconstruction
    em_3d_reconstruction.num_particlesThe number of 2D projections or 3D subtomograms used in the 3d reconstruction
    em_3d_reconstruction.refinement_typeIndicates details on how the half-map used for resolution determination (usually by FSC) have been generated.
    em_3d_reconstruction.resolutionThe final resolution (in angstroms) of the 3D reconstruction.
    em_3d_reconstruction.resolution_methodThe method used to determine the final resolution
    of the 3d reconstruction.
    The Fourier Shell Correlation criterion as a measure of
    resolution is based on the concept of splitting the (2D)
    data set into two halves; averaging each and comparing them
    using the Fourier Ring Correlation (FRC) technique.
    em_3d_reconstruction.symmetry_typeThe type of symmetry applied to the reconstruction
    em_ctf_correction.detailsAny additional details about CTF correction
    em_ctf_correction.em_image_processing_idForeign key to the EM_IMAGE_PROCESSING category
    em_ctf_correction.idPRIMARY KEY
    em_ctf_correction.typeType of CTF correction applied
    em_diffraction.camera_lengthThe camera length (in millimeters). The camera length is the
    product of the objective focal length and the combined magnification
    of the intermediate and projector lenses when the microscope is
    operated in the diffraction mode.
    em_diffraction.idPRIMARY KEY
    em_diffraction.imaging_idForeign key to the EM_IMAGING category
    em_diffraction.tilt_angle_listComma-separated list of tilt angles (in degrees) used in the electron diffraction experiment.
    em_diffraction_shell.em_diffraction_stats_idPointer to EM CRYSTALLOGRAPHY STATS
    em_diffraction_shell.fourier_space_coverageCompleteness of the structure factor data within this resolution shell, in percent
    em_diffraction_shell.high_resolutionHigh resolution limit for this shell (angstroms)
    em_diffraction_shell.idPRIMARY KEY
    em_diffraction_shell.low_resolutionLow resolution limit for this shell (angstroms)
    em_diffraction_shell.multiplicityMultiplicity (average number of measurements) for the structure factors in this resolution shell
    em_diffraction_shell.num_structure_factorsNumber of measured structure factors in this resolution shell
    em_diffraction_shell.phase_residualPhase residual for this resolution shell, in degrees
    em_diffraction_stats.detailsAny addition details about the structure factor measurements
    em_diffraction_stats.fourier_space_coverageCompleteness of the structure factor data within the defined space group
    at the reported resolution (percent).
    em_diffraction_stats.high_resolutionHigh resolution limit of the structure factor data, in angstroms
    em_diffraction_stats.idPRIMARY KEY
    em_diffraction_stats.image_processing_idPointer to _em_image_processing.id
    em_diffraction_stats.num_intensities_measuredTotal number of diffraction intensities measured (before averaging)
    em_diffraction_stats.num_structure_factorsNumber of structure factors obtained (merged amplitudes + phases)
    em_diffraction_stats.overall_phase_errorOverall phase error in degrees
    em_diffraction_stats.overall_phase_residualOverall phase residual in degrees
    em_diffraction_stats.phase_error_rejection_criteriaCriteria used to reject phases
    em_diffraction_stats.r_mergeRmerge value (percent)
    em_diffraction_stats.r_symRsym value (percent)
    em_embedding.detailsStaining procedure used in the specimen preparation.
    em_embedding.idPRIMARY KEY
    em_embedding.materialThe embedding material.
    em_embedding.specimen_idForeign key relationship to the EM SPECIMEN category
    em_entity_assembly.detailsAdditional details about the sample or sample subcomponent.
    em_entity_assembly.entity_id_listmacromolecules associated with this component, if defined
    as comma separated list of entity ids (integers).
    em_entity_assembly.idPRIMARY KEY
    em_entity_assembly.nameThe name of the sample or sample subcomponent.
    em_entity_assembly.oligomeric_detailsoligomeric details
    em_entity_assembly.parent_idThe parent of this assembly.
    This data item is an internal category pointer to _em_entity_assembly.id.
    By convention, the full assembly (top of hierarchy) is assigned parent id 0 (zero).
    em_entity_assembly.sourceThe type of source (e.g., natural source) for the component (sample or sample
    subcomponent)
    em_entity_assembly.synonymAlternative name of the component.
    em_entity_assembly.typeThe general type of the sample or sample subcomponent.
    em_experiment.aggregation_stateThe aggregation/assembly state of the imaged specimen.
    em_experiment.entity_assembly_idForeign key to the EM_ENTITY_ASSEMBLY category
    em_experiment.idPRIMARY KEY
    em_experiment.reconstruction_methodThe reconstruction method used in the EM experiment.
    em_helical_entity.angular_rotation_per_subunitThe angular rotation per helical subunit in degrees. Negative values indicate left-handed helices; positive values indicate right handed helices.
    em_helical_entity.axial_rise_per_subunitThe axial rise per subunit in the helical assembly.
    em_helical_entity.axial_symmetrySymmetry of the helical axis, either cyclic (Cn) or dihedral (Dn), where n>=1.
    em_helical_entity.detailsAny other details regarding the helical assembly
    em_helical_entity.idPRIMARY KEY
    em_helical_entity.image_processing_idThis data item is a pointer to _em_image_processing.id.
    em_image_recording.average_exposure_timeThe average exposure time for each image.
    em_image_recording.avg_electron_dose_per_imageThe electron dose received by the specimen per image (electrons per square angstrom).
    em_image_recording.detailsAny additional details about image recording.
    em_image_recording.detector_modeThe detector mode used during image recording.
    em_image_recording.film_or_detector_modelThe detector type used for recording images.
    Usually film , CCD camera or direct electron detector.
    em_image_recording.idPRIMARY KEY
    em_image_recording.imaging_idThis data item the id of the microscopy settings used in the imaging.
    em_image_recording.num_diffraction_imagesThe number of diffraction images collected.
    em_image_recording.num_grids_imagedNumber of grids in the microscopy session
    em_image_recording.num_real_imagesThe number of micrograph images collected.
    em_imaging.accelerating_voltageA value of accelerating voltage (in kV) used for imaging.
    em_imaging.alignment_procedureThe type of procedure used to align the microscope electron beam.
    em_imaging.astigmatismastigmatism
    em_imaging.c2_aperture_diameterThe open diameter of the c2 condenser lens,
    in microns.
    em_imaging.calibrated_defocus_maxThe maximum calibrated defocus value of the objective lens (in nanometers) used
    to obtain the recorded images. Negative values refer to overfocus.
    em_imaging.calibrated_defocus_minThe minimum calibrated defocus value of the objective lens (in nanometers) used
    to obtain the recorded images. Negative values refer to overfocus.
    em_imaging.calibrated_magnificationThe magnification value obtained for a known standard just
    prior to, during or just after the imaging experiment.
    em_imaging.cryogenCryogen type used to maintain the specimen stage temperature during imaging
    in the microscope.
    em_imaging.dateDate (YYYY-MM-DD) of imaging experiment or the date at which
    a series of experiments began.
    em_imaging.detailsAny additional imaging details.
    em_imaging.detector_distanceThe camera length (in millimeters). The camera length is the
    product of the objective focal length and the combined magnification
    of the intermediate and projector lenses when the microscope is
    operated in the diffraction mode.
    em_imaging.electron_beam_tilt_paramselectron beam tilt params
    em_imaging.electron_sourceThe source of electrons. The electron gun.
    em_imaging.idPRIMARY KEY
    em_imaging.illumination_modeThe mode of illumination.
    em_imaging.microscope_modelThe name of the model of microscope.
    em_imaging.modeThe mode of imaging.
    em_imaging.nominal_csThe spherical aberration coefficient (Cs) in millimeters,
    of the objective lens.
    em_imaging.nominal_defocus_maxThe maximum defocus value of the objective lens (in nanometers) used
    to obtain the recorded images. Negative values refer to overfocus.
    em_imaging.nominal_defocus_minThe minimum defocus value of the objective lens (in nanometers) used
    to obtain the recorded images. Negative values refer to overfocus.
    em_imaging.nominal_magnificationThe magnification indicated by the microscope readout.
    em_imaging.recording_temperature_maximumThe specimen temperature maximum (kelvin) for the duration
    of imaging.
    em_imaging.recording_temperature_minimumThe specimen temperature minimum (kelvin) for the duration
    of imaging.
    em_imaging.residual_tiltResidual tilt of the electron beam (in miliradians)
    em_imaging.specimen_holder_modelThe name of the model of specimen holder used during imaging.
    em_imaging.specimen_holder_typeThe type of specimen holder used during imaging.
    em_imaging.specimen_idForeign key to the EM_SPECIMEN category
    em_imaging.temperatureThe mean specimen stage temperature (in kelvin) during imaging
    in the microscope.
    em_imaging.tilt_angle_maxThe maximum angle at which the specimen was tilted to obtain
    recorded images.
    em_imaging.tilt_angle_minThe minimum angle at which the specimen was tilted to obtain
    recorded images.
    em_particle_selection.detailsAdditional detail such as description of filters used, if selection was
    manual or automated, and/or template details.
    em_particle_selection.idPRIMARY KEY
    em_particle_selection.image_processing_idThe value of _em_particle_selection.image_processing_id points to
    the EM_IMAGE_PROCESSING category.
    em_particle_selection.num_particles_selectedThe number of particles selected from the projection set of images.
    em_single_particle_entity.idPRIMARY KEY
    em_single_particle_entity.image_processing_idpointer to _em_image_processing.id.
    em_single_particle_entity.point_symmetryPoint symmetry symbol, either Cn, Dn, T, O, or I
    em_software.categoryThe purpose of the software.
    em_software.detailsDetails about the software used.
    em_software.fitting_idpointer to _em_3d_fitting.id in the EM_3D_FITTING category.
    em_software.idPRIMARY KEY
    em_software.image_processing_idpointer to _em_image_processing.id in the EM_IMAGE_PROCESSING category.
    em_software.imaging_idpointer to _em_imaging.id in the EM_IMAGING category.
    em_software.nameThe name of the software package used, e.g., RELION. Depositors are strongly
    encouraged to provide a value in this field.
    em_software.versionThe version of the software.
    em_specimen.concentrationThe concentration (in milligrams per milliliter, mg/ml)
    of the complex in the sample.
    em_specimen.detailsA description of any additional details of the specimen preparation.
    em_specimen.embedding_applied'YES' indicates that the specimen has been embedded.
    em_specimen.experiment_idPointer to _em_experiment.id.
    em_specimen.idPRIMARY KEY
    em_specimen.shadowing_applied'YES' indicates that the specimen has been shadowed.
    em_specimen.staining_applied'YES' indicates that the specimen has been stained.
    em_specimen.vitrification_applied'YES' indicates that the specimen was vitrified by cryopreservation.
    em_staining.detailsStaining procedure used in the specimen preparation.
    em_staining.idPRIMARY KEY
    em_staining.materialThe staining material.
    em_staining.specimen_idForeign key relationship to the EM SPECIMEN category
    em_staining.typetype of staining
    em_vitrification.chamber_temperatureThe temperature (in kelvin) of the sample just prior to vitrification.
    em_vitrification.cryogen_nameThis is the name of the cryogen.
    em_vitrification.detailsAny additional details relating to vitrification.
    em_vitrification.humidityRelative humidity (%) of air surrounding the specimen just prior to
    vitrification.
    em_vitrification.idPRIMARY KEY
    em_vitrification.instrumentThe type of instrument used in the vitrification process.
    em_vitrification.methodThe procedure for vitrification.
    em_vitrification.specimen_idThis data item is a pointer to _em_specimen.id
    em_vitrification.tempThe vitrification temperature (in kelvin), e.g.,
    temperature of the plunge instrument cryogen bath.
    em_vitrification.time_resolved_stateThe length of time after an event effecting the sample that
    vitrification was induced and a description of the event.
    entry.idThe value of _entry.id identifies the data block.

    Note that this item need not be a number; it can be any unique
    identifier.
    entry.ma_collection_idAn identifier for the model collection associated with the entry.
    exptl.crystals_numberThe total number of crystals used in the measurement of
    intensities.
    exptl.detailsAny special information about the experimental work prior to the
    intensity measurement. See also _exptl_crystal.preparation.
    exptl.methodThe method used in the experiment.
    exptl.method_detailsA description of special aspects of the experimental method.
    exptl_crystal.colourThe colour of the crystal.
    exptl_crystal.density_MatthewsThe density of the crystal, expressed as the ratio of the
    volume of the asymmetric unit to the molecular mass of a
    monomer of the structure, in units of angstroms^3^ per dalton.

    Ref: Matthews, B. W. (1968). J. Mol. Biol. 33, 491-497.
    exptl_crystal.density_measDensity values measured using standard chemical and physical
    methods. The units are megagrams per cubic metre (grams per
    cubic centimetre).
    exptl_crystal.density_percent_solDensity value P calculated from the crystal cell and contents,
    expressed as per cent solvent.

    P = 1 - (1.23 N MMass) / V

    N = the number of molecules in the unit cell
    MMass = the molecular mass of each molecule (gm/mole)
    V = the volume of the unit cell (A^3^)
    1.23 = a conversion factor evaluated as:

    (0.74 cm^3^/g) (10^24^ A^3^/cm^3^)
    --------------------------------------
    (6.02*10^23^) molecules/mole

    where 0.74 is an assumed value for the partial specific
    volume of the molecule
    exptl_crystal.descriptionA description of the quality and habit of the crystal.
    The crystal dimensions should not normally be reported here;
    use instead the specific items in the EXPTL_CRYSTAL category
    relating to size for the gross dimensions of the crystal and
    data items in the EXPTL_CRYSTAL_FACE category to describe the
    relationship between individual faces.
    exptl_crystal.idThe value of _exptl_crystal.id must uniquely identify a record in
    the EXPTL_CRYSTAL list.

    Note that this item need not be a number; it can be any unique
    identifier.
    exptl_crystal.pdbx_mosaicityIsotropic approximation of the distribution of mis-orientation angles
    specified in degrees of all the mosaic domain blocks in the crystal,
    represented as a standard deviation. Here, a mosaic block is a set of
    contiguous unit cells assumed to be perfectly aligned. Lower mosaicity
    indicates better ordered crystals. See for example:

    Nave, C. (1998). Acta Cryst. D54, 848-853.

    Note that many software packages estimate the mosaic rotation distribution
    differently and may combine several physical properties of the experiment
    into a single mosaic term. This term will help fit the modeled spots
    to the observed spots without necessarily being directly related to the
    physics of the crystal itself.
    exptl_crystal.pdbx_mosaicity_esdThe uncertainty in the mosaicity estimate for the crystal.
    exptl_crystal.preparationDetails of crystal growth and preparation of the crystal (e.g.
    mounting) prior to the intensity measurements.
    exptl_crystal_grow.crystal_idThis data item is a pointer to _exptl_crystal.id in the
    EXPTL_CRYSTAL category.
    exptl_crystal_grow.detailsA description of special aspects of the crystal growth.
    exptl_crystal_grow.methodThe method used to grow the crystals.
    exptl_crystal_grow.pHThe pH at which the crystal was grown. If more than one pH was
    employed during the crystallization process, the final pH should
    be noted here and the protocol involving multiple pH values
    should be described in _exptl_crystal_grow.details.
    exptl_crystal_grow.pdbx_detailsText description of crystal growth procedure.
    exptl_crystal_grow.pdbx_pH_rangeThe range of pH values at which the crystal was grown. Used when
    a point estimate of pH is not appropriate.
    exptl_crystal_grow.tempThe temperature in kelvins at which the crystal was grown.
    If more than one temperature was employed during the
    crystallization process, the final temperature should be noted
    here and the protocol involving multiple temperatures should be
    described in _exptl_crystal_grow.details.
    exptl_crystal_grow.temp_detailsA description of special aspects of temperature control during
    crystal growth.
    ma_data.content_typeThe type of data held in the dataset.
    ma_data.content_type_other_detailsDetails for other content types.
    ma_data.idA unique identifier for the data.
    ma_data.nameAn author-given name for the content held in the dataset.
    pdbx_SG_project.full_name_of_centerThe value identifies the full name of center.
    pdbx_SG_project.idA unique integer identifier for this center
    pdbx_SG_project.initial_of_centerThe value identifies the full name of center.
    pdbx_SG_project.project_nameThe value identifies the Structural Genomics project.
    pdbx_audit_revision_category.categoryThe category updated in the pdbx_audit_revision_category record.
    pdbx_audit_revision_category.data_content_typeThe type of file that the pdbx_audit_revision_history record refers to.
    pdbx_audit_revision_category.ordinalA unique identifier for the pdbx_audit_revision_category record.
    pdbx_audit_revision_category.revision_ordinalA pointer to _pdbx_audit_revision_history.ordinal
    pdbx_audit_revision_details.data_content_typeThe type of file that the pdbx_audit_revision_history record refers to.
    pdbx_audit_revision_details.descriptionAdditional details describing the revision.
    pdbx_audit_revision_details.detailsFurther details describing the revision.
    pdbx_audit_revision_details.ordinalA unique identifier for the pdbx_audit_revision_details record.
    pdbx_audit_revision_details.providerThe provider of the revision.
    pdbx_audit_revision_details.revision_ordinalA pointer to _pdbx_audit_revision_history.ordinal
    pdbx_audit_revision_details.typeA type classification of the revision
    pdbx_audit_revision_group.data_content_typeThe type of file that the pdbx_audit_revision_history record refers to.
    pdbx_audit_revision_group.groupThe collection of categories updated with this revision.
    pdbx_audit_revision_group.ordinalA unique identifier for the pdbx_audit_revision_group record.
    pdbx_audit_revision_group.revision_ordinalA pointer to _pdbx_audit_revision_history.ordinal
    pdbx_audit_revision_history.data_content_typeThe type of file that the pdbx_audit_revision_history record refers to.
    pdbx_audit_revision_history.major_revisionThe major version number of deposition release.
    pdbx_audit_revision_history.minor_revisionThe minor version number of deposition release.
    pdbx_audit_revision_history.ordinalA unique identifier for the pdbx_audit_revision_history record.
    pdbx_audit_revision_history.revision_dateThe release date of the revision
    pdbx_audit_revision_item.data_content_typeThe type of file that the pdbx_audit_revision_history record refers to.
    pdbx_audit_revision_item.itemA high level explanation the author has provided for submitting a revision.
    pdbx_audit_revision_item.ordinalA unique identifier for the pdbx_audit_revision_item record.
    pdbx_audit_revision_item.revision_ordinalA pointer to _pdbx_audit_revision_history.ordinal
    pdbx_audit_support.countryThe country/region providing the funding support for the entry.
    Funding information is optionally provided for entries after June 2016.
    pdbx_audit_support.funding_organizationThe name of the organization providing funding support for the
    entry. Funding information is optionally provided for entries
    after June 2016.
    pdbx_audit_support.grant_numberThe grant number associated with this source of support.
    pdbx_audit_support.ordinalA unique sequential integer identifier for each source of support for this entry.
    pdbx_database_PDB_obs_spr.dateThe date of replacement.
    pdbx_database_PDB_obs_spr.detailsDetails related to the replaced or replacing entry.
    pdbx_database_PDB_obs_spr.idIdentifier for the type of obsolete entry to be added to this entry.
    pdbx_database_PDB_obs_spr.pdb_idThe new PDB identifier for the replaced entry.
    pdbx_database_PDB_obs_spr.replace_pdb_idThe PDB identifier for the replaced (OLD) entry/entries.
    pdbx_database_related.content_typeThe identifying content type of the related entry.
    pdbx_database_related.db_idThe identifying code in the related database.
    pdbx_database_related.db_nameThe name of the database containing the related entry.
    pdbx_database_related.detailsA description of the related entry.
    pdbx_database_status.SG_entryThis code indicates whether the entry belongs to
    Structural Genomics Project.
    pdbx_database_status.deposit_siteThe site where the file was deposited.
    pdbx_database_status.methods_development_categoryThe methods development category in which this
    entry has been placed.
    pdbx_database_status.pdb_format_compatibleA flag indicating that the entry is compatible with the PDB format.

    A value of 'N' indicates that the no PDB format data file is
    corresponding to this entry is available in the PDB archive.
    pdbx_database_status.process_siteThe site where the file was deposited.
    pdbx_database_status.recvd_initial_deposition_dateThe date of initial deposition. (The first message for
    deposition has been received.)
    pdbx_database_status.status_codeCode for status of file.
    pdbx_database_status.status_code_csCode for status of chemical shift data file.
    pdbx_database_status.status_code_mrCode for status of NMR constraints file.
    pdbx_database_status.status_code_sfCode for status of structure factor file.
    pdbx_deposit_group.group_descriptionA description of the contents of entries in the collection.
    pdbx_deposit_group.group_idA unique identifier for a group of entries deposited as a collection.
    pdbx_deposit_group.group_titleA title to describe the group of entries deposited in the collection.
    pdbx_deposit_group.group_typeText to describe a grouping of entries in multiple collections
    pdbx_initial_refinement_model.accession_codeThis item identifies an accession code of the resource where the initial model
    is used
    pdbx_initial_refinement_model.detailsA description of special aspects of the initial model
    pdbx_initial_refinement_model.entity_id_listA comma separated list of entities reflecting the initial model used for refinement
    pdbx_initial_refinement_model.idA unique identifier for the starting model record.
    pdbx_initial_refinement_model.source_nameThis item identifies the resource of initial model used for refinement
    pdbx_initial_refinement_model.typeThis item describes the type of the initial model was generated
    pdbx_molecule_features.classBroadly defines the function of the molecule.
    pdbx_molecule_features.detailsAdditional details describing the molecule.
    pdbx_molecule_features.nameA name of the molecule.
    pdbx_molecule_features.prd_idThe value of _pdbx_molecule_features.prd_id is the accession code for this
    reference molecule.
    pdbx_molecule_features.typeDefines the structural classification of the molecule.
    pdbx_nmr_details.textAdditional details describing the NMR experiment.
    pdbx_nmr_ensemble.average_constraint_violations_per_residueThe average number of constraint violations on a per residue basis for
    the ensemble.
    pdbx_nmr_ensemble.average_constraints_per_residueThe average number of constraints per residue for the ensemble
    pdbx_nmr_ensemble.average_distance_constraint_violationThe average distance restraint violation for the ensemble.
    pdbx_nmr_ensemble.average_torsion_angle_constraint_violationThe average torsion angle constraint violation for the ensemble.
    pdbx_nmr_ensemble.conformer_selection_criteriaBy highlighting the appropriate choice(s), describe how the submitted
    conformer (models) were selected.
    pdbx_nmr_ensemble.conformers_calculated_total_numberThe total number of conformer (models) that were calculated in the final round.
    pdbx_nmr_ensemble.conformers_submitted_total_numberThe number of conformer (models) that are submitted for the ensemble.
    pdbx_nmr_ensemble.distance_constraint_violation_methodDescribe the method used to calculate the distance constraint violation statistics,
    i.e. are they calculated over all the distance constraints or calculated for
    violations only?
    pdbx_nmr_ensemble.maximum_distance_constraint_violationThe maximum distance constraint violation for the ensemble.
    pdbx_nmr_ensemble.maximum_lower_distance_constraint_violationThe maximum lower distance constraint violation for the ensemble.
    pdbx_nmr_ensemble.maximum_torsion_angle_constraint_violationThe maximum torsion angle constraint violation for the ensemble.
    pdbx_nmr_ensemble.maximum_upper_distance_constraint_violationThe maximum upper distance constraint violation for the ensemble.
    pdbx_nmr_ensemble.representative_conformerThe number of the conformer identified as most representative.
    pdbx_nmr_ensemble.torsion_angle_constraint_violation_methodThis item describes the method used to calculate the torsion angle constraint violation statistics.
    i.e. are the entered values based on all torsion angle or calculated for violations only?
    pdbx_nmr_exptl.conditions_idThe number to identify the set of sample conditions.
    pdbx_nmr_exptl.experiment_idA numerical ID for each experiment.
    pdbx_nmr_exptl.sample_statePhysical state of the sample either anisotropic or isotropic.
    pdbx_nmr_exptl.solution_idThe solution_id from the Experimental Sample to identify the sample
    that these conditions refer to.

    [Remember to save the entries here before returning to the
    Experimental Sample form]
    pdbx_nmr_exptl.spectrometer_idPointer to '_pdbx_nmr_spectrometer.spectrometer_id'
    pdbx_nmr_exptl.typeThe type of NMR experiment.
    pdbx_nmr_exptl_sample_conditions.conditions_idThe condition number as defined above.
    pdbx_nmr_exptl_sample_conditions.detailsGeneral details describing conditions of both the sample and the environment
    during measurements.
    pdbx_nmr_exptl_sample_conditions.ionic_strengthThe ionic strength at which the NMR data were collected -in lieu of
    this enter the concentration and identity of the salt in the sample.
    pdbx_nmr_exptl_sample_conditions.ionic_strength_errEstimate of the standard error for the value for the sample ionic strength.
    pdbx_nmr_exptl_sample_conditions.ionic_strength_unitsUnits for the value of the sample condition ionic strength..
    pdbx_nmr_exptl_sample_conditions.labelA descriptive label that uniquely identifies this set of sample conditions.
    pdbx_nmr_exptl_sample_conditions.pHThe pH at which the NMR data were collected.
    pdbx_nmr_exptl_sample_conditions.pH_errEstimate of the standard error for the value for the sample pH.
    pdbx_nmr_exptl_sample_conditions.pH_unitsUnits for the value of the sample condition pH.
    pdbx_nmr_exptl_sample_conditions.pressureThe pressure at which NMR data were collected.
    pdbx_nmr_exptl_sample_conditions.pressure_errEstimate of the standard error for the value for the sample pressure.
    pdbx_nmr_exptl_sample_conditions.pressure_unitsThe units of pressure at which NMR data were collected.
    pdbx_nmr_exptl_sample_conditions.temperatureThe temperature (in kelvin) at which NMR data were
    collected.
    pdbx_nmr_exptl_sample_conditions.temperature_errEstimate of the standard error for the value for the sample temperature.
    pdbx_nmr_exptl_sample_conditions.temperature_unitsUnits for the value of the sample condition temperature.
    pdbx_nmr_refine.detailsAdditional details about the NMR refinement.
    pdbx_nmr_refine.methodThe method used to determine the structure.
    pdbx_nmr_refine.software_ordinalPointer to _software.ordinal
    pdbx_nmr_representative.conformer_idIf a member of the ensemble has been selected as a representative
    structure, identify it by its model number.
    pdbx_nmr_representative.selection_criteriaBy highlighting the appropriate choice(s), describe the criteria used to
    select this structure as a representative structure, or if an average
    structure has been calculated describe how this was done.
    pdbx_nmr_sample_details.contentsA complete description of each NMR sample. Include the concentration
    and concentration units for each component (include buffers, etc.). For each
    component describe the isotopic composition, including the % labeling level,
    if known.

    For example:
    1. Uniform (random) labeling with 15N: U-15N
    2. Uniform (random) labeling with 13C, 15N at known labeling
    levels: U-95% 13C;U-98% 15N
    3. Residue selective labeling: U-95% 15N-Thymine
    4. Site specific labeling: 95% 13C-Ala18,
    5. Natural abundance labeling in an otherwise uniformly labeled
    biomolecule is designated by NA: U-13C; NA-K,H
    pdbx_nmr_sample_details.detailsBrief description of the sample providing additional information not captured by other items in the category.
    pdbx_nmr_sample_details.labelA value that uniquely identifies this sample from the other samples listed
    in the entry.
    pdbx_nmr_sample_details.solution_idThe name (number) of the sample.
    pdbx_nmr_sample_details.solvent_systemThe solvent system used for this sample.
    pdbx_nmr_sample_details.typeA descriptive term for the sample that defines the general physical properties
    of the sample.
    pdbx_nmr_software.authorsThe name of the authors of the software used in this
    procedure.
    pdbx_nmr_software.classificationThe purpose of the software.
    pdbx_nmr_software.nameThe name of the software used for the task.
    pdbx_nmr_software.ordinalAn ordinal index for this category
    pdbx_nmr_software.versionThe version of the software.
    pdbx_nmr_spectrometer.detailsA text description of the NMR spectrometer.
    pdbx_nmr_spectrometer.field_strengthThe field strength in MHz of the spectrometer
    pdbx_nmr_spectrometer.manufacturerThe name of the manufacturer of the spectrometer.
    pdbx_nmr_spectrometer.modelThe model of the NMR spectrometer.
    pdbx_nmr_spectrometer.spectrometer_idAssign a numerical ID to each instrument.
    pdbx_nmr_spectrometer.typeSelect the instrument manufacturer(s) and the model(s) of the NMR(s)
    used for this work.
    pdbx_reflns_twin.crystal_idThe crystal identifier. A reference to
    _exptl_crystal.id in category EXPTL_CRYSTAL.
    pdbx_reflns_twin.diffrn_idThe diffraction data set identifier. A reference to
    _diffrn.id in category DIFFRN.
    pdbx_reflns_twin.domain_idAn identifier for the twin domain.
    pdbx_reflns_twin.fractionThe twin fraction or twin factor represents a quantitative parameter for the
    crystal twinning. The value 0 represents no twinning, < 0.5 partial twinning,
    = 0.5 for perfect twinning.
    pdbx_reflns_twin.operatorThe possible merohedral or hemihedral twinning operators for different
    point groups are:

    True point group Twin operation hkl related to
    3 2 along a,b h,-h-k,-l
    2 along a*,b* h+k,-k,-l
    2 along c -h,-k,l
    4 2 along a,b,a*,b* h,-k,-l
    6 2 along a,b,a*,b* h,-h-k,-l
    321 2 along a*,b*,c -h,-k,l
    312 2 along a,b,c -h,-k,l
    23 4 along a,b,c k,-h,l

    References:
    Yeates, T.O. (1997) Methods in Enzymology 276, 344-358. Detecting and
    Overcoming Crystal Twinning.

    and information from the following on-line sites:

    CNS site http://cns.csb.yale.edu/v1.1/
    CCP4 site http://www.ccp4.ac.uk/dist/html/detwin.html
    SHELX site http://shelx.uni-ac.gwdg.de/~rherbst/twin.html
    pdbx_reflns_twin.typeThere are two types of twinning: merohedral or hemihedral
    non-merohedral or epitaxial

    For merohedral twinning the diffraction patterns from the different domains are
    completely superimposable. Hemihedral twinning is a special case of merohedral
    twinning. It only involves two distinct domains. Pseudo-merohedral twinning is
    a subclass merohedral twinning in which lattice is coincidentally superimposable.

    In the case of non-merohedral or epitaxial twinning the reciprocal
    lattices do not superimpose exactly. In this case the diffraction pattern
    consists of two (or more) interpenetrating lattices, which can in principle
    be separated.
    pdbx_related_exp_data_set.data_referenceA DOI reference to the related data set.
    pdbx_related_exp_data_set.data_set_typeThe type of the experimenatal data set.
    pdbx_related_exp_data_set.detailsAdditional details describing the content of the related data set and its application to
    the current investigation.
    pdbx_related_exp_data_set.metadata_referenceA DOI reference to the metadata decribing the related data set.
    pdbx_serial_crystallography_data_reduction.crystal_hitsFor experiments in which samples are provided in a
    continuous stream, the total number of frames collected
    in which the crystal was hit.
    pdbx_serial_crystallography_data_reduction.diffrn_idThe data item is a pointer to _diffrn.id in the DIFFRN
    category.
    pdbx_serial_crystallography_data_reduction.droplet_hitsFor experiments in which samples are provided in a
    continuous stream, the total number of frames collected
    in which a droplet was hit.
    pdbx_serial_crystallography_data_reduction.frame_hitsFor experiments in which samples are provided in a
    continuous stream, the total number of data frames collected
    in which the sample was hit.
    pdbx_serial_crystallography_data_reduction.frames_failed_indexFor experiments in which samples are provided in a
    continuous stream, the total number of data frames collected
    that contained a "hit" but failed to index.
    pdbx_serial_crystallography_data_reduction.frames_indexedFor experiments in which samples are provided in a
    continuous stream, the total number of data frames collected
    that were indexed.
    pdbx_serial_crystallography_data_reduction.frames_totalThe total number of data frames collected for this
    data set.
    pdbx_serial_crystallography_data_reduction.lattices_indexedFor experiments in which samples are provided in a
    continuous stream, the total number of lattices indexed.
    pdbx_serial_crystallography_data_reduction.lattices_mergedFor experiments in which samples are provided in a
    continuous stream, the total number of crystal lattices
    that were merged in the final dataset. Can be
    less than frames_indexed depending on filtering during merging or
    can be more than frames_indexed if there are multiple lattices.
    per frame.
    pdbx_serial_crystallography_data_reduction.xfel_pulse_eventsFor FEL experiments, the number of pulse events in the dataset.
    pdbx_serial_crystallography_data_reduction.xfel_run_numbersFor FEL experiments, in which data collection was performed
    in batches, indicates which subset of the data collected
    were used in producing this dataset.
    pdbx_serial_crystallography_measurement.collection_time_totalThe total number of hours required to measure this data set.
    pdbx_serial_crystallography_measurement.collimationThe collimation or type of focusing optics applied to the radiation.
    pdbx_serial_crystallography_measurement.diffrn_idThe data item is a pointer to _diffrn.id in the DIFFRN
    category.
    pdbx_serial_crystallography_measurement.focal_spot_sizeThe focal spot size of the beam
    impinging on the sample (micrometres squared).
    pdbx_serial_crystallography_measurement.photons_per_pulseThe photons per pulse measured in (tera photons (10^(12)^)/pulse units).
    pdbx_serial_crystallography_measurement.pulse_durationThe average duration (femtoseconds)
    of the pulse energy measured at the sample.
    pdbx_serial_crystallography_measurement.pulse_energyThe energy/pulse of the X-ray pulse impacting the sample measured in microjoules.
    pdbx_serial_crystallography_measurement.pulse_photon_energyThe photon energy of the X-ray pulse measured in KeV.
    pdbx_serial_crystallography_measurement.source_distanceThe distance from source to the sample along the optical axis (metres).
    pdbx_serial_crystallography_measurement.source_sizeThe dimension of the source beam measured at the source (micrometres squared).
    pdbx_serial_crystallography_measurement.xfel_pulse_repetition_rateFor FEL experiments, the pulse repetition rate measured in cycles per seconds.
    pdbx_serial_crystallography_sample_delivery.descriptionThe description of the mechanism by which the specimen in placed in the path
    of the source.
    pdbx_serial_crystallography_sample_delivery.diffrn_idThe data item is a pointer to _diffrn.id in the DIFFRN
    category.
    pdbx_serial_crystallography_sample_delivery.methodThe description of the mechanism by which the specimen in placed in the path
    of the source.
    pdbx_serial_crystallography_sample_delivery_fixed_target.crystals_per_unitThe number of crystals per dropplet or pore in fixed target
    pdbx_serial_crystallography_sample_delivery_fixed_target.descriptionFor a fixed target sample, a description of sample preparation
    pdbx_serial_crystallography_sample_delivery_fixed_target.detailsAny details pertinent to the fixed sample target
    pdbx_serial_crystallography_sample_delivery_fixed_target.diffrn_idThe data item is a pointer to _diffrn.id in the DIFFRN
    category.
    pdbx_serial_crystallography_sample_delivery_fixed_target.motion_controlDevice used to control movement of the fixed sample
    pdbx_serial_crystallography_sample_delivery_fixed_target.sample_dehydration_preventionMethod to prevent dehydration of sample
    pdbx_serial_crystallography_sample_delivery_fixed_target.sample_holdingFor a fixed target sample, mechanism to hold sample in the beam
    pdbx_serial_crystallography_sample_delivery_fixed_target.sample_solventThe sample solution content and concentration
    pdbx_serial_crystallography_sample_delivery_fixed_target.sample_unit_sizeSize of pore in grid supporting sample. Diameter or length in micrometres,
    e.g. pore diameter
    pdbx_serial_crystallography_sample_delivery_fixed_target.support_baseType of base holding the support
    pdbx_serial_crystallography_sample_delivery_fixed_target.velocity_horizontalVelocity of sample horizontally relative to a perpendicular beam in millimetres/second
    pdbx_serial_crystallography_sample_delivery_fixed_target.velocity_verticalVelocity of sample vertically relative to a perpendicular beam in millimetres/second
    pdbx_serial_crystallography_sample_delivery_injection.carrier_solventFor continuous sample flow experiments, the carrier buffer used
    to move the sample into the beam. Should include protein
    concentration.
    pdbx_serial_crystallography_sample_delivery_injection.crystal_concentrationFor continuous sample flow experiments, the concentration of
    crystals in the solution being injected.

    The concentration is measured in million crystals/ml.
    pdbx_serial_crystallography_sample_delivery_injection.descriptionFor continuous sample flow experiments, a description of the injector used
    to move the sample into the beam.
    pdbx_serial_crystallography_sample_delivery_injection.diffrn_idThe data item is a pointer to _diffrn.id in the DIFFRN
    category.
    pdbx_serial_crystallography_sample_delivery_injection.filter_sizeThe size of filter in micrometres in filtering crystals
    pdbx_serial_crystallography_sample_delivery_injection.flow_rateFor continuous sample flow experiments, the flow rate of
    solution being injected measured in ul/min.
    pdbx_serial_crystallography_sample_delivery_injection.injector_diameterFor continuous sample flow experiments, the diameter of the
    injector in micrometres.
    pdbx_serial_crystallography_sample_delivery_injection.injector_nozzleThe type of nozzle to deliver and focus sample jet
    pdbx_serial_crystallography_sample_delivery_injection.injector_pressureFor continuous sample flow experiments, the mean pressure
    in kilopascals at which the sample is injected into the beam.
    pdbx_serial_crystallography_sample_delivery_injection.injector_temperatureFor continuous sample flow experiments, the temperature in
    Kelvins of the speciman injected. This may be different from
    the temperature of the sample.
    pdbx_serial_crystallography_sample_delivery_injection.jet_diameterDiameter in micrometres of jet stream of sample delivery
    pdbx_serial_crystallography_sample_delivery_injection.power_bySample deliver driving force, e.g. Gas, Electronic Potential
    pdbx_serial_crystallography_sample_delivery_injection.preparationDetails of crystal growth and preparation of the crystals
    pdbx_soln_scatter.buffer_nameThe name of the buffer used for the sample in the solution scattering
    experiment.
    pdbx_soln_scatter.concentration_rangeThe concentration range (mg/mL) of the complex in the
    sample used in the solution scattering experiment to
    determine the mean radius of structural elongation.
    pdbx_soln_scatter.data_analysis_software_listA list of the software used in the data analysis
    pdbx_soln_scatter.data_reduction_software_listA list of the software used in the data reduction
    pdbx_soln_scatter.detector_specificThe particular radiation detector. In general this will be a
    manufacturer, description, model number or some combination of
    these.
    pdbx_soln_scatter.detector_typeThe general class of the radiation detector.
    pdbx_soln_scatter.idThe value of _pdbx_soln_scatter.id must
    uniquely identify the sample in the category PDBX_SOLN_SCATTER
    pdbx_soln_scatter.max_mean_cross_sectional_radii_gyrationThe maximum mean radius of structural elongation of the sample.
    In a given solute-solvent contrast, the radius of gyration
    R_G is a measure of structural elongation if the internal
    inhomogeneity of scattering densities has no effect. Guiner
    analysis at low Q give the R_G and the forward scattering at
    zero angle I(0).

    lnl(Q) = lnl(0) - R_G^2Q^2/3

    where
    Q = 4(pi)sin(theta/lamda)
    2theta = scattering angle
    lamda = wavelength

    The above expression is valid in a QR_G range for extended
    rod-like particles. The relative I(0)/c values ( where
    c = sample concentration) for sample measurements in a
    constant buffer for a single sample data session, gives the
    relative masses of the protein(s) studied when referenced
    against a standard.

    see:
    O.Glatter & O.Kratky, (1982). Editors of "Small angle
    X-ray Scattering, Academic Press, New York.
    O.Kratky. (1963). X-ray small angle scattering with
    substances of biological interest in diluted solutions.
    Prog. Biophys. Chem., 13, 105-173.
    G.D.Wignall & F.S.Bates, (1987). The small-angle approximation
    of X-ray and neutron scatter from rigid rods of non-uniform
    cross section and finite length. J.Appl. Crystallog., 18, 452-460.

    If the structure is elongated, the mean radius of gyration
    of the cross-sectional structure R_XS and the mean cross sectional
    intensity at zero angle [I(Q).Q]_Q->0 is obtained from
    ln[I(Q).Q] = ln[l(Q).(Q)]_Q->0 - ((R_XS)^2Q^2)/2
    pdbx_soln_scatter.max_mean_cross_sectional_radii_gyration_esdThe estimated standard deviation for the
    minimum mean radius of structural elongation of the sample.
    In a given solute-solvent contrast, the radius of gyration
    R_G is a measure of structural elongation if the internal
    inhomogeneity of scattering densities has no effect. Guiner
    analysis at low Q give the R_G and the forward scattering at
    zero angle I(0).

    lnl(Q) = lnl(0) - R_G^2Q^2/3

    where
    Q = 4(pi)sin(theta/lamda)
    2theta = scattering angle
    lamda = wavelength

    The above expression is valid in a QR_G range for extended
    rod-like particles. The relative I(0)/c values ( where
    c = sample concentration) for sample measurements in a
    constant buffer for a single sample data session, gives the
    relative masses of the protein(s) studied when referenced
    against a standard.

    see:
    O.Glatter & O.Kratky, (1982). Editors of "Small angle
    X-ray Scattering, Academic Press, New York.
    O.Kratky. (1963). X-ray small angle scattering with
    substances of biological interest in diluted solutions.
    Prog. Biophys. Chem., 13, 105-173.
    G.D.Wignall & F.S.Bates, (1987). The small-angle approximation
    of X-ray and neutron scatter from rigid rods of non-uniform
    cross section and finite length. J.Appl. Crystallog., 18, 452-460.

    If the structure is elongated, the mean radius of gyration
    of the cross-sectional structure R_XS and the mean cross sectional
    intensity at zero angle [I(Q).Q]_Q->0 is obtained from
    ln[I(Q).Q] = ln[l(Q).(Q)]_Q->0 - ((R_XS)^2Q^2)/2
    pdbx_soln_scatter.mean_guiner_radiusThe mean radius of structural elongation of the sample.
    In a given solute-solvent contrast, the radius of gyration
    R_G is a measure of structural elongation if the internal
    inhomogeneity of scattering densities has no effect. Guiner
    analysis at low Q gives the R_G and the forward scattering at
    zero angle I(0).

    lnl(Q) = lnl(0) - R_G^2Q^2/3

    where
    Q = 4(pi)sin(theta/lamda)
    2theta = scattering angle
    lamda = wavelength

    The above expression is valid in a QR_G range for extended
    rod-like particles. The relative I(0)/c values ( where
    c = sample concentration) for sample measurements in a
    constant buffer for a single sample data session, gives the
    relative masses of the protein(s) studied when referenced
    against a standard.

    see: O.Glatter & O.Kratky, (1982). Editors of "Small angle
    X-ray Scattering, Academic Press, New York.
    O.Kratky. (1963). X-ray small angle scattering with
    substances of biological interest in diluted solutions.
    Prog. Biophys. Chem., 13, 105-173.

    G.D.Wignall & F.S.Bates, (1987). The small-angle approximation
    of X-ray and neutron scatter from rigid rods of non-uniform
    cross section and finite length. J.Appl. Crystallog., 18, 452-460.

    If the structure is elongated, the mean radius of gyration
    of the cross-sectional structure R_XS and the mean cross sectional
    intensity at zero angle [I(Q).Q]_Q->0 is obtained from

    ln[I(Q).Q] = ln[l(Q).(Q)]_Q->0 - ((R_XS)^2Q^2)/2
    pdbx_soln_scatter.mean_guiner_radius_esdThe estimated standard deviation for the
    mean radius of structural elongation of the sample.
    In a given solute-solvent contrast, the radius of gyration
    R_G is a measure of structural elongation if the internal
    inhomogeneity of scattering densities has no effect. Guiner
    analysis at low Q give the R_G and the forward scattering at
    zero angle I(0).

    lnl(Q) = lnl(0) - R_G^2Q^2/3

    where
    Q = 4(pi)sin(theta/lamda)
    2theta = scattering angle
    lamda = wavelength

    The above expression is valid in a QR_G range for extended
    rod-like particles. The relative I(0)/c values ( where
    c = sample concentration) for sample measurements in a
    constant buffer for a single sample data session, gives the
    relative masses of the protein(s) studied when referenced
    against a standard.

    see:
    O.Glatter & O.Kratky, (1982). Editors of "Small angle
    X-ray Scattering, Academic Press, New York.
    O.Kratky. (1963). X-ray small angle scattering with
    substances of biological interest in diluted solutions.
    Prog. Biophys. Chem., 13, 105-173.
    G.D.Wignall & F.S.Bates, (1987). The small-angle approximation
    of X-ray and neutron scatter from rigid rods of non-uniform
    cross section and finite length. J.Appl. Crystallog., 18, 452-460.

    If the structure is elongated, the mean radius of gyration
    of the cross-sectional structure R_XS and the mean cross sectional
    intensity at zero angle [I(Q).Q]_Q->0 is obtained from
    ln[I(Q).Q] = ln[l(Q).(Q)]_Q->0 - ((R_XS)^2Q^2)/2
    pdbx_soln_scatter.min_mean_cross_sectional_radii_gyrationThe minimum mean radius of structural elongation of the sample.
    In a given solute-solvent contrast, the radius of gyration
    R_G is a measure of structural elongation if the internal
    inhomogeneity of scattering densities has no effect. Guiner
    analysis at low Q give the R_G and the forward scattering at
    zero angle I(0).

    lnl(Q) = lnl(0) - R_G^2Q^2/3

    where
    Q = 4(pi)sin(theta/lamda)
    2theta = scattering angle
    lamda = wavelength

    The above expression is valid in a QR_G range for extended
    rod-like particles. The relative I(0)/c values ( where
    c = sample concentration) for sample measurements in a
    constant buffer for a single sample data session, gives the
    relative masses of the protein(s) studied when referenced
    against a standard.

    see:
    O.Glatter & O.Kratky, (1982). Editors of "Small angle
    X-ray Scattering, Academic Press, New York.
    O.Kratky. (1963). X-ray small angle scattering with
    substances of biological interest in diluted solutions.
    Prog. Biophys. Chem., 13, 105-173.
    G.D.Wignall & F.S.Bates, (1987). The small-angle approximation
    of X-ray and neutron scatter from rigid rods of non-uniform
    cross section and finite length. J.Appl. Crystallog., 18, 452-460.

    If the structure is elongated, the mean radius of gyration
    of the cross-sectional structure R_XS and the mean cross sectional
    intensity at zero angle [I(Q).Q]_Q->0 is obtained from
    ln[I(Q).Q] = ln[l(Q).(Q)]_Q->0 - ((R_XS)^2Q^2)/2
    pdbx_soln_scatter.min_mean_cross_sectional_radii_gyration_esdThe estimated standard deviation for the
    minimum mean radius of structural elongation of the sample.
    In a given solute-solvent contrast, the radius of gyration
    R_G is a measure of structural elongation if the internal
    inhomogeneity of scattering densities has no effect. Guiner
    analysis at low Q give the R_G and the forward scattering at
    zero angle I(0).

    lnl(Q) = lnl(0) - R_G^2Q^2/3

    where
    Q = 4(pi)sin(theta/lamda)
    2theta = scattering angle
    lamda = wavelength

    The above expression is valid in a QR_G range for extended
    rod-like particles. The relative I(0)/c values ( where
    c = sample concentration) for sample measurements in a
    constant buffer for a single sample data session, gives the
    relative masses of the protein(s) studied when referenced
    against a standard.

    see:
    O.Glatter & O.Kratky, (1982). Editors of "Small angle
    X-ray Scattering, Academic Press, New York.
    O.Kratky. (1963). X-ray small angle scattering with
    substances of biological interest in diluted solutions.
    Prog. Biophys. Chem., 13, 105-173.
    G.D.Wignall & F.S.Bates, (1987). The small-angle approximation
    of X-ray and neutron scatter from rigid rods of non-uniform
    cross section and finite length. J.Appl. Crystallog., 18, 452-460.

    If the structure is elongated, the mean radius of gyration
    of the cross-sectional structure R_XS and the mean cross sectional
    intensity at zero angle [I(Q).Q]_Q->0 is obtained from

    ln[I(Q).Q] = ln[l(Q).(Q)]_Q->0 - ((R_XS)^2Q^2)/2
    pdbx_soln_scatter.num_time_framesThe number of time frame solution scattering images used.
    pdbx_soln_scatter.protein_lengthThe length (or range) of the protein sample under study.
    If the solution structure is approximated as an elongated elliptical
    cyclinder the length L is determined from,

    L = sqrt [12( (R_G)^2 - (R_XS)^2 ) ]

    The length should also be given by

    L = pi I(0) / [ I(Q).Q]_Q->0
    pdbx_soln_scatter.sample_pHThe pH value of the buffered sample.
    pdbx_soln_scatter.source_beamlineThe beamline name used for the experiment
    pdbx_soln_scatter.source_beamline_instrumentThe instrumentation used on the beamline
    pdbx_soln_scatter.source_classThe general class of the radiation source.
    pdbx_soln_scatter.source_typeThe make, model, name or beamline of the source of radiation.
    pdbx_soln_scatter.temperatureThe temperature in kelvins at which the experiment
    was conducted
    pdbx_soln_scatter.typeThe type of solution scattering experiment carried out
    pdbx_soln_scatter_model.conformer_selection_criteriaA description of the conformer selection criteria
    used.
    pdbx_soln_scatter_model.detailsA description of any additional details concerning the experiment.
    pdbx_soln_scatter_model.entry_fitting_listA list of the entries used to fit the model
    to the scattering data
    pdbx_soln_scatter_model.idThe value of _pdbx_soln_scatter_model.id must
    uniquely identify the sample in the category PDBX_SOLN_SCATTER_MODEL
    pdbx_soln_scatter_model.methodA description of the methods used in the modelling
    pdbx_soln_scatter_model.num_conformers_calculatedThe number of model conformers calculated.
    pdbx_soln_scatter_model.num_conformers_submittedThe number of model conformers submitted in the entry
    pdbx_soln_scatter_model.representative_conformerThe index of the representative conformer among the submitted conformers for the entry
    pdbx_soln_scatter_model.scatter_idThis data item is a pointer to _pdbx_soln_scatter.id in the PDBX_SOLN_SCATTER category.
    pdbx_soln_scatter_model.software_author_listA list of the software authors
    pdbx_soln_scatter_model.software_listA list of the software used in the modeeling
    pdbx_vrpt_summary.RNA_suitenessThe MolProbity conformer-match quality parameter for RNA structures.
    Low values are worse. Specific to structures that contain RNA polymers.
    pdbx_vrpt_summary.attempted_validation_stepsThe steps that were attempted by the validation pipeline software.
    A step typically involves running a 3rd party validation tool, for instance "mogul"
    Each step will be enumerated in _pdbx_vrpt_software category.
    pdbx_vrpt_summary.ligands_for_buster_reportA flag indicating if there are ligands in the model used for detailed Buster analysis.
    pdbx_vrpt_summary.report_creation_dateThe date, time and time-zone that the validation report was created.
    The string will be formatted like yyyy-mm-dd:hh:mm in GMT time.
    pdbx_vrpt_summary.restypes_notchecked_for_bond_angle_geometryThis is a comma separated list of the residue types whose bond lengths and bond angles have
    not been checked against "standard geometry" using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996)
    pdbx_vrpt_summary_diffraction.B_factor_typeAn indicator if isotropic B factors are partial or full values.
    pdbx_vrpt_summary_diffraction.Babinet_bREFMAC scaling parameter as reported in log output line starting 'bulk solvent: scale'.
    X-ray entry specific, obtained in the EDS step from REFMAC calculation.
    pdbx_vrpt_summary_diffraction.Babinet_kREFMAC scaling parameter as reported in log output line starting 'bulk solvent: scale'.
    X-ray entry specific, obtained in the EDS step from REFMAC calculation.
    pdbx_vrpt_summary_diffraction.CCP4_versionThe version of CCP4 suite used in the analysis.
    pdbx_vrpt_summary_diffraction.DCC_RThe overall R-factor from a DCC recalculation of an electron density map.
    Currently value is rounded to 2 decimal places.
    X-ray entry specific, obtained from the DCC program.
    pdbx_vrpt_summary_diffraction.DCC_RfreeRfree as calculated by DCC.
    pdbx_vrpt_summary_diffraction.EDS_RThe overall R factor from the EDS REFMAC calculation (no free set is used in this).
    Currently value is rounded to 2 decimal places.
    X-ray entry specific, obtained in the eds step from REFMAC calculation.
    pdbx_vrpt_summary_diffraction.EDS_R_warningWarning message when EDS calculated R vs reported R is higher than a threshold
    pdbx_vrpt_summary_diffraction.EDS_res_highThe data high resolution diffraction limit, in Angstroms, found in the input structure factor file.
    X-ray entry specific, obtained in the EDS step.
    pdbx_vrpt_summary_diffraction.EDS_res_lowThe data low resolution diffraction limit, in Angstroms, found in the input structure factor file.
    X-ray entry specific, obtained in the EDS step.
    pdbx_vrpt_summary_diffraction.Fo_Fc_correlationFo,Fc correlation: The difference between the observed structure factors (Fo) and the
    calculated structure factors (Fc) measures the correlation between the model and the
    experimental data.
    X-ray entry specific, obtained in the eds step from REFMAC calculation.
    pdbx_vrpt_summary_diffraction.I_over_sigmaEach reflection has an intensity (I) and an uncertainty in measurement
    (sigma(I)), so I/sigma(I) is the signal-to-noise ratio. This
    ratio decreases at higher resolution. <I/sigma(I)> is the mean of individual I/sigma(I)
    values. Value for outer resolution shell is given in parentheses. In case
    structure factor amplitudes are deposited, Xtriage estimates the intensities
    first and then calculates this metric. When intensities are available in the
    deposited file, these are converted to amplitudes and then back to intensity
    estimate before calculating the metric.
    X-ray entry specific, calculated by Phenix Xtriage program.
    pdbx_vrpt_summary_diffraction.Padilla_Yeates_L2_meanPadilla and Yeates twinning parameter <|L**2|>.
    Theoretical values is 0.333 in the untwinned case, and 0.2 in the perfectly twinned case.
    X-ray entry specific, obtained from the Xtriage program.
    pdbx_vrpt_summary_diffraction.Padilla_Yeates_L_meanPadilla and Yeates twinning parameter <|L|>.
    Theoretical values is 0.5 in the untwinned case, and 0.375 in the perfectly twinned case.
    X-ray entry specific, obtained from the Xtriage program.
    pdbx_vrpt_summary_diffraction.Q_scoreThe overall Q-score of the fit of coordinates to the electron map.
    The Q-score is defined in Pintilie, GH. et al., Nature Methods, 17, 328-334 (2020)
    pdbx_vrpt_summary_diffraction.Wilson_B_anisoResult of absolute likelihood based Wilson scaling,
    The anisotropic B value of the data is determined using a likelihood based approach.
    The resulting B tensor is reported, the 3 diagonal values are given first, followed
    by the 3 off diagonal values.
    A large spread in (especially the diagonal) values indicates anisotropy.
    X-ray entry specific, calculated by Phenix Xtriage program.
    pdbx_vrpt_summary_diffraction.Wilson_B_estimateAn estimate of the overall B-value of the structure, calculated from the diffraction data.
    Units Angstroms squared.
    It serves as an indicator of the degree of order in the crystal and the value is usually
    not hugely different from the average B-value calculated from the model.
    X-ray entry specific, calculated by Phenix Xtriage program.
    pdbx_vrpt_summary_diffraction.acentric_outliersThe number of acentric reflections that Xtriage identifies as outliers on the basis
    of Wilson statistics. Note that if pseudo translational symmetry is present,
    a large number of 'outliers' will be present.
    X-ray entry specific, calculated by Phenix Xtriage program.
    pdbx_vrpt_summary_diffraction.bulk_solvent_bREFMAC scaling parameter as reported in log output file.
    X-ray entry specific, obtained in the EDS step from REFMAC calculation.
    pdbx_vrpt_summary_diffraction.bulk_solvent_kREFMAC reported scaling parameter.
    X-ray entry specific, obtained in the EDS step from REFMAC calculation.
    pdbx_vrpt_summary_diffraction.centric_outliersThe number of centric reflections that Xtriage identifies as outliers.
    X-ray entry specific, calculated by Phenix Xtriage program.
    pdbx_vrpt_summary_diffraction.data_anisotropyThe ratio (Bmax - Bmin) / Bmean where Bmax, Bmin and Bmean are computed from the B-values
    associated with the principal axes of the anisotropic thermal ellipsoid.
    This ratio is usually less than 0.5; for only 1% of PDB entries it is more than 1.0 (Read et al., 2011).
    X-ray entry specific, obtained from the Xtriage program.
    pdbx_vrpt_summary_diffraction.data_completenessThe percent completeness of diffraction data.
    pdbx_vrpt_summary_diffraction.density_fitness_versionThe version of density-fitness suite programs used in the analysis.
    pdbx_vrpt_summary_diffraction.exp_methodExperimental method for statistics
    pdbx_vrpt_summary_diffraction.num_miller_indicesThe number of Miller Indices reported by the Xtriage program. This should be the same as the
    number of _refln in the input structure factor file.
    X-ray entry specific, calculated by Phenix Xtriage program.
    pdbx_vrpt_summary_diffraction.number_reflns_R_freeThe number of reflections in the free set as defined in the input structure factor file supplied to the validation pipeline.
    X-ray entry specific, obtained from the DCC program.
    pdbx_vrpt_summary_diffraction.percent_RSRZ_outliersThe percent of RSRZ outliers.
    pdbx_vrpt_summary_diffraction.percent_free_reflectionsA percentage, Normally percent proportion of the total number. Between 0% and 100%.
    pdbx_vrpt_summary_diffraction.servalcat_versionThe version of Servalcat program used in the analysis.
    pdbx_vrpt_summary_diffraction.trans_NCS_detailsA sentence giving the result of Xtriage's analysis on translational NCS.
    X-ray entry specific, obtained from the Xtriage program.
    pdbx_vrpt_summary_diffraction.twin_fractionEstimated twinning fraction for operators as identified by Xtriage. A semicolon separated
    list of operators with fractions is givens
    X-ray entry specific, obtained from the Xtriage program.
    pdbx_vrpt_summary_em.Q_scoreThe overall Q-score of the fit of coordinates to the electron map.
    The Q-score is defined in Pintilie, GH. et al., Nature Methods, 17, 328-334 (2020)
    pdbx_vrpt_summary_em.atom_inclusion_all_atomsThe proportion of all non hydrogen atoms within density.
    pdbx_vrpt_summary_em.atom_inclusion_backboneThe proportion of backbone atoms within density.
    pdbx_vrpt_summary_em.author_provided_fsc_resolution_by_cutoff_halfbitThe resolution from the intersection of the author provided fsc and the indicator curve halfbit.
    pdbx_vrpt_summary_em.author_provided_fsc_resolution_by_cutoff_onebitThe resolution from the intersection of the author provided fsc and the indicator curve onebit.
    pdbx_vrpt_summary_em.author_provided_fsc_resolution_by_cutoff_pt_143The resolution from the intersection of the author provided fsc and the indicator curve 0.143.
    pdbx_vrpt_summary_em.author_provided_fsc_resolution_by_cutoff_pt_333The resolution from the intersection of the author provided fsc and the indicator curve 0.333.
    pdbx_vrpt_summary_em.author_provided_fsc_resolution_by_cutoff_pt_5The resolution from the intersection of the author provided fsc and the indicator curve 0.5.
    pdbx_vrpt_summary_em.author_provided_fsc_resolution_by_cutoff_threesigmaThe resolution from the intersection of the author provided fsc and the indicator curve threesigma.
    pdbx_vrpt_summary_em.calculated_fsc_resolution_by_cutoff_halfbitThe resolution from the intersection of the fsc curve generated by from the provided halfmaps and the indicator curve halfbit.
    pdbx_vrpt_summary_em.calculated_fsc_resolution_by_cutoff_onebitThe resolution from the intersection of the fsc curve generated by from the provided halfmaps and the indicator curve onebit.
    pdbx_vrpt_summary_em.calculated_fsc_resolution_by_cutoff_pt_143The resolution from the intersection of the fsc curve generated by from the provided halfmaps and the indicator curve 0.143.
    pdbx_vrpt_summary_em.calculated_fsc_resolution_by_cutoff_pt_333The resolution from the intersection of the fsc curve generated by from the provided halfmaps and the indicator curve 0.333.
    pdbx_vrpt_summary_em.calculated_fsc_resolution_by_cutoff_pt_5The resolution from the intersection of the fsc curve generated by from the provided halfmaps and the indicator curve 0.5.
    pdbx_vrpt_summary_em.calculated_fsc_resolution_by_cutoff_threesigmaThe resolution from the intersection of the fsc curve generated by from the provided halfmaps and the indicator curve threesigma.
    pdbx_vrpt_summary_em.contour_level_primary_mapThe recommended contour level for the primary map of this deposition.
    pdbx_vrpt_summary_em.exp_methodExperimental method for statistics
    pdbx_vrpt_summary_geometry.angles_RMSZThe overall root mean square of the Z-score for deviations of bond angles in comparison to
    "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    This value is for all chains in the structure.
    pdbx_vrpt_summary_geometry.bonds_RMSZThe overall root mean square of the Z-score for deviations of bond lengths in comparison to
    "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    This value is for all chains in the structure.
    pdbx_vrpt_summary_geometry.clashscoreThis score is derived from the number of pairs of atoms in the PDB_model_num that are unusually close to each other.
    It is calculated by the MolProbity pdbx_vrpt_software and expressed as the number or such clashes per thousand atoms.
    For structures determined by NMR the clashscore value here will only consider label_atom_id pairs in the
    well-defined (core) residues from ensemble analysis.
    pdbx_vrpt_summary_geometry.clashscore_full_lengthOnly given for structures determined by NMR. The MolProbity pdbx_vrpt_instance_clashes score for all label_atom_id pairs.
    pdbx_vrpt_summary_geometry.num_H_reduceThis is the number of hydrogen atoms added and optimized by the MolProbity reduce pdbx_vrpt_software as part of the
    all-atom clashscore.
    pdbx_vrpt_summary_geometry.num_angles_RMSZThe number of bond angles compared to "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    This value is for all chains in the structure.
    pdbx_vrpt_summary_geometry.num_bonds_RMSZThe number of bond lengths compared to "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    This value is for all chains in the structure.
    pdbx_vrpt_summary_geometry.percent_ramachandran_outliersThe percentage of residues with Ramachandran outliers.
    pdbx_vrpt_summary_geometry.percent_ramachandran_outliers_full_lengthOnly given for structures determined by NMR. The MolProbity Ramachandran outlier score
    for all atoms in the structure rather than just the well-defined (core) residues.
    pdbx_vrpt_summary_geometry.percent_rotamer_outliersThe MolProbity sidechain outlier score (a percentage).
    Protein sidechains mostly adopt certain (combinations of) preferred torsion angle values
    (called rotamers or rotameric conformers), much like their backbone torsion angles
    (as assessed in the Ramachandran analysis). MolProbity considers the sidechain conformation
    of a residue to be an outlier if its set of torsion angles is not similar to any preferred
    combination. The sidechain outlier score is calculated as the percentage of residues
    with an unusual sidechain conformation with respect to the total number of residues for
    which the assessment is available.
    Example: percent-rota-outliers="2.44".
    Specific to structure that contain protein chains and have sidechains modelled.
    For NMR structures only the well-defined (core) residues from ensemble analysis will be considered.
    The percentage of residues with rotamer outliers.
    pdbx_vrpt_summary_geometry.percent_rotamer_outliers_full_lengthOnly given for structures determined by NMR. The MolProbity sidechain outlier score
    for all atoms in the structure rather than just the well-defined (core) residues.
    pdbx_vrpt_summary_nmr.chemical_shift_completenessOverall completeness of the chemical shift assignments for the well-defined
    regions of the structure.
    pdbx_vrpt_summary_nmr.chemical_shift_completeness_full_lengthOverall completeness of the chemical shift assignments for the full
    macromolecule or complex as suggested by the molecular description of an entry
    (whether some portion of it is modelled or not).
    pdbx_vrpt_summary_nmr.cyrange_errorDiagnostic message from the wrapper of Cyrange software which identifies the
    well-defined cores (domains) of NMR protein structures.
    pdbx_vrpt_summary_nmr.cyrange_number_of_domainsTotal number of well-defined cores (domains) identified by Cyrange
    pdbx_vrpt_summary_nmr.exp_methodExperimental method for statistics
    pdbx_vrpt_summary_nmr.medoid_modelFor each Cyrange well-defined core ("cyrange_domain") the id of the PDB_model_num which is most
    similar to other models as measured by pairwise RMSDs over the domain.
    For the whole entry ("Entry"), the medoid PDB_model_num of the largest core is taken as an overall
    representative of the structure.
    pdbx_vrpt_summary_nmr.nmr_models_consistency_flagA flag indicating if all models in the NMR ensemble contain the exact
    same atoms ("True") or if the models differ in this respect ("False").
    pdbx_vrpt_summary_nmr.nmrclust_errorDiagnostic message from the wrapper of NMRClust software which clusters NMR models.
    pdbx_vrpt_summary_nmr.nmrclust_number_of_clustersTotal number of clusters in the NMR ensemble identified by NMRClust.
    pdbx_vrpt_summary_nmr.nmrclust_number_of_modelsNumber of models analysed by NMRClust - should in almost all cases be the
    same as the number of models in the NMR ensemble.
    pdbx_vrpt_summary_nmr.nmrclust_number_of_outliersNumber of models that do not belong to any cluster as deemed by NMRClust.
    pdbx_vrpt_summary_nmr.nmrclust_representative_modelOverall representative PDB_model_num of the NMR ensemble as identified by NMRClust.
    rcsb_accession_info.deposit_dateThe entry deposition date.
    rcsb_accession_info.has_released_experimental_dataA code indicating the current availibility of experimental data in the repository.
    rcsb_accession_info.initial_release_dateThe entry initial release date.
    rcsb_accession_info.major_revisionThe latest entry major revision number.
    rcsb_accession_info.minor_revisionThe latest entry minor revision number.
    rcsb_accession_info.revision_dateThe latest entry revision date.
    rcsb_accession_info.status_codeThe release status for the entry.
    rcsb_comp_model_provenance.entry_idEntry identifier corresponding to the computed structure model.
    rcsb_comp_model_provenance.source_dbSource database for the computed structure model.
    rcsb_comp_model_provenance.source_filenameSource filename for the computed structure model.
    rcsb_comp_model_provenance.source_pae_urlSource URL for computed structure model predicted aligned error (PAE) json file.
    rcsb_comp_model_provenance.source_urlSource URL for computed structure model file.
    rcsb_entry_container_identifiers.assembly_idsList of identifiers for assemblies generated from the entry.
    rcsb_entry_container_identifiers.branched_entity_idsList of identifiers for the branched entity constituents for the entry.
    rcsb_entry_container_identifiers.emdb_idsList of EMDB identifiers for the 3D electron microscopy density maps
    used in the production of the structure model.
    rcsb_entry_container_identifiers.entity_idsList of identifiers or the entity constituents for the entry.
    rcsb_entry_container_identifiers.entry_idEntry identifier for the container.
    rcsb_entry_container_identifiers.model_idsList of PDB model identifiers for the entry.
    rcsb_entry_container_identifiers.non_polymer_entity_idsList of identifiers for the non-polymer entity constituents for the entry.
    rcsb_entry_container_identifiers.polymer_entity_idsList of identifiers for the polymer entity constituents for the entry.
    rcsb_entry_container_identifiers.rcsb_idA unique identifier for each object in this entry container.
    rcsb_entry_container_identifiers.related_emdb_idsList of EMDB identifiers for the 3D electron microscopy density maps
    related to the structure model.
    rcsb_entry_container_identifiers.water_entity_idsList of identifiers for the solvent/water entity constituents for the entry.
    rcsb_entry_container_identifiers.pubmed_idUnique integer value assigned to each PubMed record.
    rcsb_entry_info.assembly_countThe number of assemblies defined for this entry including the deposited assembly.
    rcsb_entry_info.branched_entity_countThe number of distinct branched entities in the structure entry.
    rcsb_entry_info.branched_molecular_weight_maximumThe maximum molecular mass (KDa) of a branched entity in the deposited structure entry.
    rcsb_entry_info.branched_molecular_weight_minimumThe minimum molecular mass (KDa) of a branched entity in the deposited structure entry.
    rcsb_entry_info.cis_peptide_countThe number of cis-peptide linkages per deposited structure model.
    rcsb_entry_info.deposited_atom_countThe number of heavy atom coordinates records per deposited structure model.
    rcsb_entry_info.deposited_deuterated_water_countThe number of deuterated water molecules per deposited structure model.
    rcsb_entry_info.deposited_hydrogen_atom_countThe number of hydrogen atom coordinates records per deposited structure model.
    rcsb_entry_info.deposited_model_countThe number of model structures deposited.
    rcsb_entry_info.deposited_modeled_polymer_monomer_countThe number of modeled polymer monomers in the deposited coordinate data.
    This is the total count of monomers with reported coordinate data for all polymer
    entity instances in the deposited coordinate data.
    rcsb_entry_info.deposited_nonpolymer_entity_instance_countThe number of non-polymer instances in the deposited data set.
    This is the total count of non-polymer entity instances reported
    per deposited structure model.
    rcsb_entry_info.deposited_polymer_entity_instance_countThe number of polymer instances in the deposited data set.
    This is the total count of polymer entity instances reported
    per deposited structure model.
    rcsb_entry_info.deposited_polymer_monomer_countThe number of polymer monomers in sample entity instances in the deposited data set.
    This is the total count of monomers for all polymer entity instances reported
    per deposited structure model.
    rcsb_entry_info.deposited_solvent_atom_countThe number of heavy solvent atom coordinates records per deposited structure model.
    rcsb_entry_info.deposited_unmodeled_polymer_monomer_countThe number of unmodeled polymer monomers in the deposited coordinate data. This is
    the total count of monomers with unreported coordinate data for all polymer
    entity instances per deposited structure model.
    rcsb_entry_info.diffrn_radiation_wavelength_maximumThe maximum radiation wavelength in angstroms.
    rcsb_entry_info.diffrn_radiation_wavelength_minimumThe minimum radiation wavelength in angstroms.
    rcsb_entry_info.disulfide_bond_countThe number of disulfide bonds per deposited structure model.
    rcsb_entry_info.entity_countThe number of distinct polymer, non-polymer, branched molecular, and solvent entities per deposited structure model.
    rcsb_entry_info.experimental_methodThe category of experimental method(s) used to determine the structure entry.
    rcsb_entry_info.experimental_method_countThe number of experimental methods contributing data to the structure determination.
    rcsb_entry_info.inter_mol_covalent_bond_countThe number of intermolecular covalent bonds.
    rcsb_entry_info.inter_mol_metalic_bond_countThe number of intermolecular metalic bonds.
    rcsb_entry_info.molecular_weightThe molecular mass (KDa) of polymer and non-polymer entities (exclusive of solvent) in the deposited structure entry.
    rcsb_entry_info.na_polymer_entity_typesNucleic acid polymer entity type categories describing the entry.
    rcsb_entry_info.ndb_struct_conf_na_feature_combinedThis data item identifies secondary structure
    features of nucleic acids in the entry.
    rcsb_entry_info.nonpolymer_bound_componentsBound nonpolymer components in this entry.
    rcsb_entry_info.nonpolymer_entity_countThe number of distinct non-polymer entities in the structure entry exclusive of solvent.
    rcsb_entry_info.nonpolymer_molecular_weight_maximumThe maximum molecular mass (KDa) of a non-polymer entity in the deposited structure entry.
    rcsb_entry_info.nonpolymer_molecular_weight_minimumThe minimum molecular mass (KDa) of a non-polymer entity in the deposited structure entry.
    rcsb_entry_info.polymer_compositionCategories describing the polymer entity composition for the entry.
    rcsb_entry_info.polymer_entity_countThe number of distinct polymer entities in the structure entry.
    rcsb_entry_info.polymer_entity_count_DNAThe number of distinct DNA polymer entities.
    rcsb_entry_info.polymer_entity_count_RNAThe number of distinct RNA polymer entities.
    rcsb_entry_info.polymer_entity_count_nucleic_acidThe number of distinct nucleic acid polymer entities (DNA or RNA).
    rcsb_entry_info.polymer_entity_count_nucleic_acid_hybridThe number of distinct hybrid nucleic acid polymer entities.
    rcsb_entry_info.polymer_entity_count_proteinThe number of distinct protein polymer entities.
    rcsb_entry_info.polymer_entity_taxonomy_countThe number of distinct taxonomies represented among the polymer entities in the entry.
    rcsb_entry_info.polymer_molecular_weight_maximumThe maximum molecular mass (KDa) of a polymer entity in the deposited structure entry.
    rcsb_entry_info.polymer_molecular_weight_minimumThe minimum molecular mass (KDa) of a polymer entity in the deposited structure entry.
    rcsb_entry_info.polymer_monomer_count_maximumThe maximum monomer count of a polymer entity per deposited structure model.
    rcsb_entry_info.polymer_monomer_count_minimumThe minimum monomer count of a polymer entity per deposited structure model.
    rcsb_entry_info.resolution_combinedCombined estimates of experimental resolution contributing to the refined structural model.
    Resolution reported in "refine.ls_d_res_high" is used for X-RAY DIFFRACTION, FIBER DIFFRACTION,
    POWDER DIFFRACTION, ELECTRON CRYSTALLOGRAPHY, and NEUTRON DIFFRACTION as identified in
    "refine.pdbx_refine_id".
    Resolution reported in "em_3d_reconstruction.resolution" is used for ELECTRON MICROSCOPY.
    The best value corresponding to "em_3d_reconstruction.resolution_method" == "FSC 0.143 CUT-OFF"
    is used, if available. If not, the best "em_3d_reconstruction.resolution" value is used.
    For structures that are not obtained from diffraction-based methods, the resolution values in
    "refine.ls_d_res_high" are ignored.
    Multiple values are reported only if multiple methods are used in the structure determination.
    rcsb_entry_info.selected_polymer_entity_typesSelected polymer entity type categories describing the entry.
    rcsb_entry_info.software_programs_combinedCombined list of software programs names reported in connection with the production of this entry.
    rcsb_entry_info.solvent_entity_countThe number of distinct solvent entities per deposited structure model.
    rcsb_entry_info.structure_determination_methodologyIndicates if the structure was determined using experimental or computational methods.
    rcsb_entry_info.structure_determination_methodology_priorityIndicates the priority of the value in _rcsb_entry_info.structure_determination_methodology.
    The lower the number the higher the priority.
    Priority values for "experimental" structures is currently set to 10 and
    the values for "computational" structures is set to 100.
    rcsb_entry_info.diffrn_resolution_high.provenance_sourceThe provenence source for the high resolution limit of data collection.
    rcsb_entry_info.diffrn_resolution_high.valueThe high resolution limit of data collection.
    rcsb_ma_qa_metric_global.model_idThe model identifier.
    rcsb_ma_qa_metric_global.ma_qa_metric_global.descriptionDescription of the global QA metric.
    rcsb_ma_qa_metric_global.ma_qa_metric_global.nameName of the global QA metric.
    rcsb_ma_qa_metric_global.ma_qa_metric_global.typeThe type of global QA metric.
    rcsb_ma_qa_metric_global.ma_qa_metric_global.type_other_detailsDetails for other type of global QA metric.
    rcsb_ma_qa_metric_global.ma_qa_metric_global.valueValue of the global QA metric.
    rcsb_primary_citation.book_id_ISBNThe International Standard Book Number (ISBN) code assigned to
    the book cited; relevant for books or book chapters.
    rcsb_primary_citation.book_publisherThe name of the publisher of the citation; relevant
    for books or book chapters.
    rcsb_primary_citation.book_publisher_cityThe location of the publisher of the citation; relevant
    for books or book chapters.
    rcsb_primary_citation.book_titleThe title of the book in which the citation appeared; relevant
    for books or book chapters.
    rcsb_primary_citation.coordinate_linkage_rcsb_primary_citation.coordinate_linkage states whether this citation
    is concerned with precisely the set of coordinates given in the
    data block. If, for instance, the publication described the same
    structure, but the coordinates had undergone further refinement
    prior to the creation of the data block, the value of this data
    item would be 'no'.
    rcsb_primary_citation.countryThe country/region of publication; relevant for books
    and book chapters.
    rcsb_primary_citation.idThe value of _rcsb_primary_citation.id must uniquely identify a record in the
    CITATION list.

    The _rcsb_primary_citation.id 'primary' should be used to indicate the
    citation that the author(s) consider to be the most pertinent to
    the contents of the data block.

    Note that this item need not be a number; it can be any unique
    identifier.
    rcsb_primary_citation.journal_abbrevAbbreviated name of the cited journal as given in the
    Chemical Abstracts Service Source Index.
    rcsb_primary_citation.journal_id_ASTMThe American Society for Testing and Materials (ASTM) code
    assigned to the journal cited (also referred to as the CODEN
    designator of the Chemical Abstracts Service); relevant for
    journal articles.
    rcsb_primary_citation.journal_id_CSDThe Cambridge Structural Database (CSD) code assigned to the
    journal cited; relevant for journal articles. This is also the
    system used at the Protein Data Bank (PDB).
    rcsb_primary_citation.journal_id_ISSNThe International Standard Serial Number (ISSN) code assigned to
    the journal cited; relevant for journal articles.
    rcsb_primary_citation.journal_issueIssue number of the journal cited; relevant for journal
    articles.
    rcsb_primary_citation.journal_volumeVolume number of the journal cited; relevant for journal
    articles.
    rcsb_primary_citation.languageLanguage in which the cited article is written.
    rcsb_primary_citation.page_firstThe first page of the citation; relevant for journal
    articles, books and book chapters.
    rcsb_primary_citation.page_lastThe last page of the citation; relevant for journal
    articles, books and book chapters.
    rcsb_primary_citation.pdbx_database_id_DOIDocument Object Identifier used by doi.org to uniquely
    specify bibliographic entry.
    rcsb_primary_citation.pdbx_database_id_PubMedAscession number used by PubMed to categorize a specific
    bibliographic entry.
    rcsb_primary_citation.rcsb_ORCID_identifiersThe Open Researcher and Contributor ID (ORCID) identifiers for the citation authors.
    rcsb_primary_citation.rcsb_authorsNames of the authors of the citation; relevant for journal
    articles, books and book chapters. Names are separated by vertical bars.

    The family name(s), followed by a comma and including any
    dynastic components, precedes the first name(s) or initial(s).
    rcsb_primary_citation.rcsb_journal_abbrevNormalized journal abbreviation.
    rcsb_primary_citation.titleThe title of the citation; relevant for journal articles, books
    and book chapters.
    rcsb_primary_citation.yearThe year of the citation; relevant for journal articles, books
    and book chapters.
    refine.B_iso_maxThe maximum isotropic displacement parameter (B value)
    found in the coordinate set.
    refine.B_iso_meanThe mean isotropic displacement parameter (B value)
    for the coordinate set.
    refine.B_iso_minThe minimum isotropic displacement parameter (B value)
    found in the coordinate set.
    refine.aniso_B_1_1The [1][1] element of the matrix that defines the overall
    anisotropic displacement model if one was refined for this
    structure.
    refine.aniso_B_1_2The [1][2] element of the matrix that defines the overall
    anisotropic displacement model if one was refined for this
    structure.
    refine.aniso_B_1_3The [1][3] element of the matrix that defines the overall
    anisotropic displacement model if one was refined for this
    structure.
    refine.aniso_B_2_2The [2][2] element of the matrix that defines the overall
    anisotropic displacement model if one was refined for this
    structure.
    refine.aniso_B_2_3The [2][3] element of the matrix that defines the overall
    anisotropic displacement model if one was refined for this
    structure.
    refine.aniso_B_3_3The [3][3] element of the matrix that defines the overall
    anisotropic displacement model if one was refined for this
    structure.
    refine.correlation_coeff_Fo_to_FcThe correlation coefficient between the observed and
    calculated structure factors for reflections included in
    the refinement.

    The correlation coefficient is scale-independent and gives
    an idea of the quality of the refined model.

    sum~i~(Fo~i~ Fc~i~ - <Fo><Fc>)
    R~corr~ = ------------------------------------------------------------
    SQRT{sum~i~(Fo~i~)^2^-<Fo>^2^} SQRT{sum~i~(Fc~i~)^2^-<Fc>^2^}

    Fo = observed structure factors
    Fc = calculated structure factors
    <> denotes average value

    summation is over reflections included in the refinement
    refine.correlation_coeff_Fo_to_Fc_freeThe correlation coefficient between the observed and
    calculated structure factors for reflections not included
    in the refinement (free reflections).

    The correlation coefficient is scale-independent and gives
    an idea of the quality of the refined model.

    sum~i~(Fo~i~ Fc~i~ - <Fo><Fc>)
    R~corr~ = ------------------------------------------------------------
    SQRT{sum~i~(Fo~i~)^2^-<Fo>^2^} SQRT{sum~i~(Fc~i~)^2^-<Fc>^2^}

    Fo = observed structure factors
    Fc = calculated structure factors
    <> denotes average value

    summation is over reflections not included
    in the refinement (free reflections)
    refine.detailsDescription of special aspects of the refinement process.
    refine.ls_R_factor_R_freeResidual factor R for reflections that satisfy the resolution
    limits established by _refine.ls_d_res_high and
    _refine.ls_d_res_low and the observation limit established by
    _reflns.observed_criterion, and that were used as the test
    reflections (i.e. were excluded from the refinement) when the
    refinement included the calculation of a 'free' R factor.
    Details of how reflections were assigned to the working and
    test sets are given in _reflns.R_free_details.

    sum|F~obs~ - F~calc~|
    R = ---------------------
    sum|F~obs~|

    F~obs~ = the observed structure-factor amplitudes
    F~calc~ = the calculated structure-factor amplitudes

    sum is taken over the specified reflections
    refine.ls_R_factor_R_free_errorThe estimated error in _refine.ls_R_factor_R_free.
    The method used to estimate the error is described in the
    item _refine.ls_R_factor_R_free_error_details.
    refine.ls_R_factor_R_free_error_detailsSpecial aspects of the method used to estimated the error in
    _refine.ls_R_factor_R_free.
    refine.ls_R_factor_R_workResidual factor R for reflections that satisfy the resolution
    limits established by _refine.ls_d_res_high and
    _refine.ls_d_res_low and the observation limit established by
    _reflns.observed_criterion, and that were used as the working
    reflections (i.e. were included in the refinement) when the
    refinement included the calculation of a 'free' R factor.
    Details of how reflections were assigned to the working and
    test sets are given in _reflns.R_free_details.

    _refine.ls_R_factor_obs should not be confused with
    _refine.ls_R_factor_R_work; the former reports the results of a
    refinement in which all observed reflections were used, the
    latter a refinement in which a subset of the observed
    reflections were excluded from refinement for the calculation
    of a 'free' R factor. However, it would be meaningful to quote
    both values if a 'free' R factor were calculated for most of
    the refinement, but all of the observed reflections were used
    in the final rounds of refinement; such a protocol should be
    explained in _refine.details.

    sum|F~obs~ - F~calc~|
    R = ---------------------
    sum|F~obs~|

    F~obs~ = the observed structure-factor amplitudes
    F~calc~ = the calculated structure-factor amplitudes

    sum is taken over the specified reflections
    refine.ls_R_factor_allResidual factor R for all reflections that satisfy the resolution
    limits established by _refine.ls_d_res_high and
    _refine.ls_d_res_low.

    sum|F~obs~ - F~calc~|
    R = ---------------------
    sum|F~obs~|

    F~obs~ = the observed structure-factor amplitudes
    F~calc~ = the calculated structure-factor amplitudes

    sum is taken over the specified reflections
    refine.ls_R_factor_obsResidual factor R for reflections that satisfy the resolution
    limits established by _refine.ls_d_res_high and
    _refine.ls_d_res_low and the observation limit established by
    _reflns.observed_criterion.

    _refine.ls_R_factor_obs should not be confused with
    _refine.ls_R_factor_R_work; the former reports the results of a
    refinement in which all observed reflections were used, the
    latter a refinement in which a subset of the observed
    reflections were excluded from refinement for the calculation
    of a 'free' R factor. However, it would be meaningful to quote
    both values if a 'free' R factor were calculated for most of
    the refinement, but all of the observed reflections were used
    in the final rounds of refinement; such a protocol should be
    explained in _refine.details.

    sum|F~obs~ - F~calc~|
    R = ---------------------
    sum|F~obs~|

    F~obs~ = the observed structure-factor amplitudes
    F~calc~ = the calculated structure-factor amplitudes

    sum is taken over the specified reflections
    refine.ls_d_res_highThe smallest value for the interplanar spacings for the
    reflection data used in the refinement in angstroms. This is
    called the highest resolution.
    refine.ls_d_res_lowThe largest value for the interplanar spacings for
    the reflection data used in the refinement in angstroms.
    This is called the lowest resolution.
    refine.ls_matrix_typeType of matrix used to accumulate the least-squares derivatives.
    refine.ls_number_parametersThe number of parameters refined in the least-squares process.
    If possible, this number should include some contribution from
    the restrained parameters. The restrained parameters are
    distinct from the constrained parameters (where one or more
    parameters are linearly dependent on the refined value of
    another). Least-squares restraints often depend on geometry or
    energy considerations and this makes their direct contribution
    to this number, and to the goodness-of-fit calculation,
    difficult to assess.
    refine.ls_number_reflns_R_freeThe number of reflections that satisfy the resolution limits
    established by _refine.ls_d_res_high and _refine.ls_d_res_low
    and the observation limit established by
    _reflns.observed_criterion, and that were used as the test
    reflections (i.e. were excluded from the refinement) when the
    refinement included the calculation of a 'free' R factor.
    Details of how reflections were assigned to the working and
    test sets are given in _reflns.R_free_details.
    refine.ls_number_reflns_R_workThe number of reflections that satisfy the resolution limits
    established by _refine.ls_d_res_high and _refine.ls_d_res_low
    and the observation limit established by
    _reflns.observed_criterion, and that were used as the working
    reflections (i.e. were included in the refinement) when the
    refinement included the calculation of a 'free' R factor.
    Details of how reflections were assigned to the working and
    test sets are given in _reflns.R_free_details.
    refine.ls_number_reflns_allThe number of reflections that satisfy the resolution limits
    established by _refine.ls_d_res_high and _refine.ls_d_res_low.
    refine.ls_number_reflns_obsThe number of reflections that satisfy the resolution limits
    established by _refine.ls_d_res_high and _refine.ls_d_res_low
    and the observation limit established by
    _reflns.observed_criterion.
    refine.ls_number_restraintsThe number of restrained parameters. These are parameters which
    are not directly dependent on another refined parameter.
    Restrained parameters often involve geometry or energy
    dependencies.
    See also _atom_site.constraints and _atom_site.refinement_flags.
    A general description of refinement constraints may appear in
    _refine.details.
    refine.ls_percent_reflns_R_freeThe number of reflections that satisfy the resolution limits
    established by _refine.ls_d_res_high and _refine.ls_d_res_low
    and the observation limit established by
    _reflns.observed_criterion, and that were used as the test
    reflections (i.e. were excluded from the refinement) when the
    refinement included the calculation of a 'free' R factor,
    expressed as a percentage of the number of geometrically
    observable reflections that satisfy the resolution limits.
    refine.ls_percent_reflns_obsThe number of reflections that satisfy the resolution limits
    established by _refine.ls_d_res_high and _refine.ls_d_res_low
    and the observation limit established by
    _reflns.observed_criterion, expressed as a percentage of the
    number of geometrically observable reflections that satisfy
    the resolution limits.
    refine.ls_redundancy_reflns_allThe ratio of the total number of observations of the
    reflections that satisfy the resolution limits established by
    _refine.ls_d_res_high and _refine.ls_d_res_low to the number
    of crystallographically unique reflections that satisfy the
    same limits.
    refine.ls_redundancy_reflns_obsThe ratio of the total number of observations of the
    reflections that satisfy the resolution limits established by
    _refine.ls_d_res_high and _refine.ls_d_res_low and the
    observation limit established by _reflns.observed_criterion to
    the number of crystallographically unique reflections that
    satisfy the same limits.
    refine.ls_wR_factor_R_freeWeighted residual factor wR for reflections that satisfy the
    resolution limits established by _refine.ls_d_res_high and
    _refine.ls_d_res_low and the observation limit established by
    _reflns.observed_criterion, and that were used as the test
    reflections (i.e. were excluded from the refinement) when the
    refinement included the calculation of a 'free' R factor.
    Details of how reflections were assigned to the working and
    test sets are given in _reflns.R_free_details.

    ( sum|w |Y~obs~ - Y~calc~|^2^| )^1/2^
    wR = ( ---------------------------- )
    ( sum|w Y~obs~^2^| )

    Y~obs~ = the observed amplitude specified by
    _refine.ls_structure_factor_coef
    Y~calc~ = the calculated amplitude specified by
    _refine.ls_structure_factor_coef
    w = the least-squares weight

    sum is taken over the specified reflections
    refine.ls_wR_factor_R_workWeighted residual factor wR for reflections that satisfy the
    resolution limits established by _refine.ls_d_res_high and
    _refine.ls_d_res_low and the observation limit established by
    _reflns.observed_criterion, and that were used as the working
    reflections (i.e. were included in the refinement) when the
    refinement included the calculation of a 'free' R factor.
    Details of how reflections were assigned to the working and
    test sets are given in _reflns.R_free_details.

    ( sum|w |Y~obs~ - Y~calc~|^2^| )^1/2^
    wR = ( ---------------------------- )
    ( sum|w Y~obs~^2^| )

    Y~obs~ = the observed amplitude specified by
    _refine.ls_structure_factor_coef
    Y~calc~ = the calculated amplitude specified by
    _refine.ls_structure_factor_coef
    w = the least-squares weight

    sum is taken over the specified reflections
    refine.occupancy_maxThe maximum value for occupancy found in the coordinate set.
    refine.occupancy_minThe minimum value for occupancy found in the coordinate set.
    refine.overall_FOM_free_R_setAverage figure of merit of phases of reflections not included
    in the refinement.

    This value is derived from the likelihood function.

    FOM = I~1~(X)/I~0~(X)

    I~0~, I~1~ = zero- and first-order modified Bessel functions
    of the first kind
    X = sigma~A~ |E~o~| |E~c~|/SIGMA
    E~o~, E~c~ = normalized observed and calculated structure
    factors
    sigma~A~ = <cos 2 pi s delta~x~> SQRT(Sigma~P~/Sigma~N~)
    estimated using maximum likelihood
    Sigma~P~ = sum~{atoms in model}~ f^2^
    Sigma~N~ = sum~{atoms in crystal}~ f^2^
    f = form factor of atoms
    delta~x~ = expected error
    SIGMA = (sigma~{E;exp}~)^2^ + epsilon [1-(sigma~A~)^2^]
    sigma~{E;exp}~ = uncertainties of normalized observed
    structure factors
    epsilon = multiplicity of the diffracting plane

    Ref: Murshudov, G. N., Vagin, A. A. & Dodson, E. J. (1997).
    Acta Cryst. D53, 240-255.
    refine.overall_FOM_work_R_setAverage figure of merit of phases of reflections included in
    the refinement.

    This value is derived from the likelihood function.

    FOM = I~1~(X)/I~0~(X)

    I~0~, I~1~ = zero- and first-order modified Bessel functions
    of the first kind
    X = sigma~A~ |E~o~| |E~c~|/SIGMA
    E~o~, E~c~ = normalized observed and calculated structure
    factors
    sigma~A~ = <cos 2 pi s delta~x~> SQRT(Sigma~P~/Sigma~N~)
    estimated using maximum likelihood
    Sigma~P~ = sum~{atoms in model}~ f^2^
    Sigma~N~ = sum~{atoms in crystal}~ f^2^
    f = form factor of atoms
    delta~x~ = expected error
    SIGMA = (sigma~{E;exp}~)^2^ + epsilon [1-(sigma~A~)^2^]
    sigma~{E;exp}~ = uncertainties of normalized observed
    structure factors
    epsilon = multiplicity of the diffracting plane

    Ref: Murshudov, G. N., Vagin, A. A. & Dodson, E. J. (1997).
    Acta Cryst. D53, 240-255.
    refine.overall_SU_BThe overall standard uncertainty (estimated standard deviation)
    of the displacement parameters based on a maximum-likelihood
    residual.

    The overall standard uncertainty (sigma~B~)^2^ gives an idea
    of the uncertainty in the B values of averagely defined
    atoms (atoms with B values equal to the average B value).

    N~a~
    (sigma~B~)^2^ = 8 ----------------------------------------------
    sum~i~ {[1/Sigma - (E~o~)^2^ (1-m^2^)](SUM_AS)s^4^}

    N~a~ = number of atoms
    E~o~ = normalized structure factors
    m = figure of merit of phases of reflections
    included in the summation
    s = reciprocal-space vector

    SUM_AS = (sigma~A~)^2^/Sigma^2^
    Sigma = (sigma~{E;exp}~)^2^ + epsilon [1-(sigma~A~)^2^]
    sigma~{E;exp}~ = experimental uncertainties of normalized
    structure factors
    sigma~A~ = <cos 2 pi s delta~x~> SQRT(Sigma~P~/Sigma~N~)
    estimated using maximum likelihood
    Sigma~P~ = sum~{atoms in model}~ f^2^
    Sigma~N~ = sum~{atoms in crystal}~ f^2^
    f = atom form factor
    delta~x~ = expected error
    epsilon = multiplicity of diffracting plane

    summation is over all reflections included in refinement

    Ref: (sigma~A~ estimation) "Refinement of macromolecular
    structures by the maximum-likelihood method",
    Murshudov, G. N., Vagin, A. A. & Dodson, E. J. (1997).
    Acta Cryst. D53, 240-255.

    (SU B estimation) Murshudov, G. N. & Dodson,
    E. J. (1997). Simplified error estimation a la
    Cruickshank in macromolecular crystallography.
    CCP4 Newsletter on Protein Crystallography, No. 33,
    January 1997, pp. 31-39.

    http://www.ccp4.ac.uk/newsletters/newsletter33/murshudov.html
    refine.overall_SU_MLThe overall standard uncertainty (estimated standard deviation)
    of the positional parameters based on a maximum likelihood
    residual.

    The overall standard uncertainty (sigma~X~)^2^ gives an
    idea of the uncertainty in the position of averagely
    defined atoms (atoms with B values equal to average B value)

    3 N~a~
    (sigma~X~)^2^ = ---------------------------------------------------------
    8 pi^2^ sum~i~ {[1/Sigma - (E~o~)^2^ (1-m^2^)](SUM_AS)s^2^}

    N~a~ = number of atoms
    E~o~ = normalized structure factors
    m = figure of merit of phases of reflections
    included in the summation
    s = reciprocal-space vector

    SUM_AS = (sigma~A~)^2^/Sigma^2^
    Sigma = (sigma~{E;exp}~)^2^ + epsilon [1-(sigma~A~)^2^]
    sigma~{E;exp}~ = experimental uncertainties of normalized
    structure factors
    sigma~A~ = <cos 2 pi s delta~x~> SQRT(Sigma~P~/Sigma~N~)
    estimated using maximum likelihood
    Sigma~P~ = sum~{atoms in model}~ f^2^
    Sigma~N~ = sum~{atoms in crystal}~ f^2^
    f = atom form factor
    delta~x~ = expected error
    epsilon = multiplicity of diffracting plane

    summation is over all reflections included in refinement

    Ref: (sigma_A estimation) "Refinement of macromolecular
    structures by the maximum-likelihood method",
    Murshudov, G. N., Vagin, A. A. & Dodson, E. J. (1997).
    Acta Cryst. D53, 240-255.

    (SU ML estimation) Murshudov, G. N. & Dodson,
    E. J. (1997). Simplified error estimation a la
    Cruickshank in macromolecular crystallography.
    CCP4 Newsletter on Protein Crystallography, No. 33,
    January 1997, pp. 31-39.

    http://www.ccp4.ac.uk/newsletters/newsletter33/murshudov.html
    refine.overall_SU_R_Cruickshank_DPIThe overall standard uncertainty (estimated standard deviation)
    of the displacement parameters based on the crystallographic
    R value, expressed in a formalism known as the dispersion
    precision indicator (DPI).

    The overall standard uncertainty (sigma~B~) gives an idea
    of the uncertainty in the B values of averagely defined
    atoms (atoms with B values equal to the average B value).

    N~a~
    (sigma~B~)^2^ = 0.65 ---------- (R~value~)^2^ (D~min~)^2^ C^-2/3^
    (N~o~-N~p~)


    N~a~ = number of atoms included in refinement
    N~o~ = number of observations
    N~p~ = number of parameters refined
    R~value~ = conventional crystallographic R value
    D~min~ = maximum resolution
    C = completeness of data

    Ref: Cruickshank, D. W. J. (1999). Acta Cryst. D55, 583-601.

    Murshudov, G. N. & Dodson,
    E. J. (1997). Simplified error estimation a la
    Cruickshank in macromolecular crystallography.
    CCP4 Newsletter on Protein Crystallography, No. 33,
    January 1997, pp. 31-39.

    http://www.ccp4.ac.uk/newsletters/newsletter33/murshudov.html
    refine.overall_SU_R_freeThe overall standard uncertainty (estimated standard deviation)
    of the displacement parameters based on the free R value.

    The overall standard uncertainty (sigma~B~) gives an idea
    of the uncertainty in the B values of averagely defined
    atoms (atoms with B values equal to the average B value).

    N~a~
    (sigma~B~)^2^ = 0.65 ---------- (R~free~)^2^ (D~min~)^2^ C^-2/3^
    (N~o~-N~p~)


    N~a~ = number of atoms included in refinement
    N~o~ = number of observations
    N~p~ = number of parameters refined
    R~free~ = conventional free crystallographic R value calculated
    using reflections not included in refinement
    D~min~ = maximum resolution
    C = completeness of data

    Ref: Cruickshank, D. W. J. (1999). Acta Cryst. D55, 583-601.

    Murshudov, G. N. & Dodson,
    E. J. (1997). Simplified error estimation a la
    Cruickshank in macromolecular crystallography.
    CCP4 Newsletter on Protein Crystallography, No. 33,
    January 1997, pp. 31-39.

    http://www.ccp4.ac.uk/newsletters/newsletter33/murshudov.html
    refine.pdbx_R_Free_selection_detailsDetails of the manner in which the cross validation
    reflections were selected.
    refine.pdbx_TLS_residual_ADP_flagA flag for TLS refinements identifying the type of atomic displacement parameters stored
    in _atom_site.B_iso_or_equiv.
    refine.pdbx_average_fsc_freeAverage Fourier Shell Correlation (avgFSC) between model and
    observed structure factors for reflections not included in refinement.

    The average FSC is a measure of the agreement between observed
    and calculated structure factors.

    sum(N~i~ FSC~free-i~)
    avgFSC~free~ = ---------------------
    sum(N~i~)


    N~i~ = the number of free reflections in the resolution shell i
    FSC~free-i~ = FSC for free reflections in the i-th resolution shell calculated as:

    (sum(|F~o~| |F~c~| fom cos(phi~c~-phi~o~)))
    FSC~free-i~ = -------------------------------------------
    (sum(|F~o~|^2^) (sum(|F~c~|^2^)))^1/2^

    |F~o~| = amplitude of observed structure factor
    |F~c~| = amplitude of calculated structure factor
    phi~o~ = phase of observed structure factor
    phi~c~ = phase of calculated structure factor
    fom = figure of merit of the experimental phases.

    Summation of FSC~free-i~ is carried over all free reflections in the resolution shell.

    Summation of avgFSC~free~ is carried over all resolution shells.


    Ref: Rosenthal P.B., Henderson R.
    "Optimal determination of particle orientation, absolute hand,
    and contrast loss in single-particle electron cryomicroscopy.
    Journal of Molecular Biology. 2003;333(4):721-745, equation (A6).
    refine.pdbx_average_fsc_overallOverall average Fourier Shell Correlation (avgFSC) between model and
    observed structure factors for all reflections.

    The average FSC is a measure of the agreement between observed
    and calculated structure factors.

    sum(N~i~ FSC~i~)
    avgFSC = ----------------
    sum(N~i~)


    N~i~ = the number of all reflections in the resolution shell i
    FSC~i~ = FSC for all reflections in the i-th resolution shell calculated as:

    (sum(|F~o~| |F~c~| fom cos(phi~c~-phi~o~)))
    FSC~i~ = -------------------------------------------
    (sum(|F~o~|^2^) (sum(|F~c~|^2^)))^1/2^

    |F~o~| = amplitude of observed structure factor
    |F~c~| = amplitude of calculated structure factor
    phi~o~ = phase of observed structure factor
    phi~c~ = phase of calculated structure factor
    fom = figure of merit of the experimental phases.

    Summation of FSC~i~ is carried over all reflections in the resolution shell.

    Summation of avgFSC is carried over all resolution shells.


    Ref: Rosenthal P.B., Henderson R.
    "Optimal determination of particle orientation, absolute hand,
    and contrast loss in single-particle electron cryomicroscopy.
    Journal of Molecular Biology. 2003;333(4):721-745, equation (A6).
    refine.pdbx_average_fsc_workAverage Fourier Shell Correlation (avgFSC) between model and
    observed structure factors for reflections included in refinement.

    The average FSC is a measure of the agreement between observed
    and calculated structure factors.

    sum(N~i~ FSC~work-i~)
    avgFSC~work~ = ---------------------
    sum(N~i~)


    N~i~ = the number of working reflections in the resolution shell i
    FSC~work-i~ = FSC for working reflections in the i-th resolution shell calculated as:

    (sum(|F~o~| |F~c~| fom cos(phi~c~-phi~o~)))
    FSC~work-i~ = -------------------------------------------
    (sum(|F~o~|^2^) (sum(|F~c~|^2^)))^1/2^

    |F~o~| = amplitude of observed structure factor
    |F~c~| = amplitude of calculated structure factor
    phi~o~ = phase of observed structure factor
    phi~c~ = phase of calculated structure factor
    fom = figure of merit of the experimental phases.

    Summation of FSC~work-i~ is carried over all working reflections in the resolution shell.

    Summation of avgFSC~work~ is carried over all resolution shells.


    Ref: Rosenthal P.B., Henderson R.
    "Optimal determination of particle orientation, absolute hand,
    and contrast loss in single-particle electron cryomicroscopy.
    Journal of Molecular Biology. 2003;333(4):721-745, equation (A6).
    refine.pdbx_data_cutoff_high_absFValue of F at "high end" of data cutoff.
    refine.pdbx_data_cutoff_high_rms_absFValue of RMS |F| used as high data cutoff.
    refine.pdbx_data_cutoff_low_absFValue of F at "low end" of data cutoff.
    refine.pdbx_diffrn_idAn identifier for the diffraction data set used in this refinement.

    Multiple diffraction data sets specified as a comma separated list.
    refine.pdbx_isotropic_thermal_modelWhether the structure was refined with indvidual
    isotropic, anisotropic or overall temperature factor.
    refine.pdbx_ls_cross_valid_methodWhether the cross validataion method was used through
    out or only at the end.
    refine.pdbx_ls_sigma_FData cutoff (SIGMA(F))
    refine.pdbx_ls_sigma_FsqdData cutoff (SIGMA(F^2))
    refine.pdbx_ls_sigma_IData cutoff (SIGMA(I))
    refine.pdbx_method_to_determine_structMethod(s) used to determine the structure.
    refine.pdbx_overall_ESU_ROverall estimated standard uncertainties of positional
    parameters based on R value.
    refine.pdbx_overall_ESU_R_FreeOverall estimated standard uncertainties of positional parameters based on R free value.
    refine.pdbx_overall_SU_R_Blow_DPIThe overall standard uncertainty (estimated standard deviation)
    of the displacement parameters based on the crystallographic
    R value, expressed in a formalism known as the dispersion
    precision indicator (DPI).

    Ref: Blow, D (2002) Acta Cryst. D58, 792-797
    refine.pdbx_overall_SU_R_free_Blow_DPIThe overall standard uncertainty (estimated standard deviation)
    of the displacement parameters based on the crystallographic
    R-free value, expressed in a formalism known as the dispersion
    precision indicator (DPI).

    Ref: Blow, D (2002) Acta Cryst. D58, 792-797
    refine.pdbx_overall_SU_R_free_Cruickshank_DPIThe overall standard uncertainty (estimated standard deviation)
    of the displacement parameters based on the crystallographic
    R-free value, expressed in a formalism known as the dispersion
    precision indicator (DPI).

    Ref: Cruickshank, D. W. J. (1999). Acta Cryst. D55, 583-601.
    refine.pdbx_overall_phase_errorThe overall phase error for all reflections after refinement using
    the current refinement target.
    refine.pdbx_refine_idThis data item uniquely identifies a refinement within an entry.
    _refine.pdbx_refine_id can be used to distinguish the results of
    joint refinements.
    refine.pdbx_solvent_ion_probe_radiiFor bulk solvent mask calculation, the amount that the ionic radii of atoms, which can be ions, are increased used.
    refine.pdbx_solvent_shrinkage_radiiFor bulk solvent mask calculation, amount mask is shrunk after taking away atoms with new radii and a constant value assigned to this new region.
    refine.pdbx_solvent_vdw_probe_radiiFor bulk solvent mask calculation, the value by which the vdw radii of non-ion atoms (like carbon) are increased and used.
    refine.pdbx_starting_modelStarting model for refinement. Starting model for
    molecular replacement should refer to a previous
    structure or experiment.
    refine.pdbx_stereochem_target_val_spec_caseSpecial case of stereochemistry target values used
    in SHELXL refinement.
    refine.pdbx_stereochemistry_target_valuesStereochemistry target values used in refinement.
    refine.solvent_model_detailsSpecial aspects of the solvent model used during refinement.
    refine.solvent_model_param_bsolThe value of the BSOL solvent-model parameter describing
    the average isotropic displacement parameter of disordered
    solvent atoms.

    This is one of the two parameters (the other is
    _refine.solvent_model_param_ksol) in Tronrud's method of
    modelling the contribution of bulk solvent to the
    scattering. The standard scale factor is modified according
    to the expression

    k0 exp(-B0 * s^2^)[1-KSOL * exp(-BSOL * s^2^)]

    where k0 and B0 are the scale factors for the protein.

    Ref: Tronrud, D. E. (1997). Methods Enzymol. 277, 243-268.
    refine.solvent_model_param_ksolThe value of the KSOL solvent-model parameter describing
    the ratio of the electron density in the bulk solvent to the
    electron density in the molecular solute.

    This is one of the two parameters (the other is
    _refine.solvent_model_param_bsol) in Tronrud's method of
    modelling the contribution of bulk solvent to the
    scattering. The standard scale factor is modified according
    to the expression

    k0 exp(-B0 * s^2^)[1-KSOL * exp(-BSOL * s^2^)]

    where k0 and B0 are the scale factors for the protein.

    Ref: Tronrud, D. E. (1997). Methods Enzymol. 277, 243-268.
    refine_analyze.Luzzati_coordinate_error_freeThe estimated coordinate error obtained from the plot of
    the R value versus sin(theta)/lambda for the reflections
    treated as a test set during refinement.

    Ref: Luzzati, V. (1952). Traitement statistique des erreurs
    dans la determination des structures cristallines. Acta
    Cryst. 5, 802-810.
    refine_analyze.Luzzati_coordinate_error_obsThe estimated coordinate error obtained from the plot of
    the R value versus sin(theta)/lambda for reflections classified
    as observed.

    Ref: Luzzati, V. (1952). Traitement statistique des erreurs
    dans la determination des structures cristallines. Acta
    Cryst. 5, 802-810.
    refine_analyze.Luzzati_d_res_low_freeThe value of the low-resolution cutoff used in constructing the
    Luzzati plot for reflections treated as a test set during
    refinement.

    Ref: Luzzati, V. (1952). Traitement statistique des erreurs
    dans la determination des structures cristallines. Acta
    Cryst. 5, 802-810.
    refine_analyze.Luzzati_d_res_low_obsThe value of the low-resolution cutoff used in
    constructing the Luzzati plot for reflections classified as
    observed.

    Ref: Luzzati, V. (1952). Traitement statistique des erreurs
    dans la determination des structures cristallines. Acta
    Cryst. 5, 802-810.
    refine_analyze.Luzzati_sigma_a_freeThe value of sigma~a~ used in constructing the Luzzati plot for
    the reflections treated as a test set during refinement.
    Details of the estimation of sigma~a~ can be specified
    in _refine_analyze.Luzzati_sigma_a_free_details.

    Ref: Luzzati, V. (1952). Traitement statistique des erreurs
    dans la determination des structures cristallines. Acta
    Cryst. 5, 802-810.
    refine_analyze.Luzzati_sigma_a_obsThe value of sigma~a~ used in constructing the Luzzati plot for
    reflections classified as observed. Details of the
    estimation of sigma~a~ can be specified in
    _refine_analyze.Luzzati_sigma_a_obs_details.

    Ref: Luzzati, V. (1952). Traitement statistique des erreurs
    dans la determination des structures cristallines. Acta
    Cryst. 5, 802-810.
    refine_analyze.number_disordered_residuesThe number of discretely disordered residues in the refined
    model.
    refine_analyze.occupancy_sum_hydrogenThe sum of the occupancies of the hydrogen atoms in the refined
    model.
    refine_analyze.occupancy_sum_non_hydrogenThe sum of the occupancies of the non-hydrogen atoms in the
    refined model.
    refine_analyze.pdbx_Luzzati_d_res_high_obsrecord the high resolution for calculating Luzzati statistics.
    refine_analyze.pdbx_refine_idThis data item uniquely identifies a refinement within an entry.
    _refine_analyze.pdbx_refine_id can be used to distinguish the results
    of joint refinements.
    refine_hist.cycle_idThe value of _refine_hist.cycle_id must uniquely identify a
    record in the REFINE_HIST list.

    Note that this item need not be a number; it can be any unique
    identifier.
    refine_hist.d_res_highThe lowest value for the interplanar spacings for the
    reflection data for this cycle of refinement. This is called
    the highest resolution.
    refine_hist.d_res_lowThe highest value for the interplanar spacings for the
    reflection data for this cycle of refinement. This is
    called the lowest resolution.
    refine_hist.number_atoms_solventThe number of solvent atoms that were included in the model at
    this cycle of the refinement.
    refine_hist.number_atoms_totalThe total number of atoms that were included in the model at
    this cycle of the refinement.
    refine_hist.pdbx_B_iso_mean_ligandMean isotropic B-value for ligand molecules included in refinement.
    refine_hist.pdbx_B_iso_mean_solventMean isotropic B-value for solvent molecules included in refinement.
    refine_hist.pdbx_number_atoms_ligandNumber of ligand atoms included in refinement
    refine_hist.pdbx_number_atoms_nucleic_acidNumber of nucleic atoms included in refinement
    refine_hist.pdbx_number_atoms_proteinNumber of protein atoms included in refinement
    refine_hist.pdbx_number_residues_totalTotal number of polymer residues included in refinement.
    refine_hist.pdbx_refine_idThis data item uniquely identifies a refinement within an entry.
    _refine_hist.pdbx_refine_id can be used to distinguish the results
    of joint refinements.
    refine_ls_restr.dev_idealFor the given parameter type, the root-mean-square deviation
    between the ideal values used as restraints in the least-squares
    refinement and the values obtained by refinement. For instance,
    bond distances may deviate by 0.018 \%A (r.m.s.) from ideal
    values in the current model.
    refine_ls_restr.dev_ideal_targetFor the given parameter type, the target root-mean-square
    deviation between the ideal values used as restraints in the
    least-squares refinement and the values obtained by refinement.
    refine_ls_restr.numberThe number of parameters of this type subjected to restraint in
    least-squares refinement.
    refine_ls_restr.pdbx_refine_idThis data item uniquely identifies a refinement within an entry.
    _refine_ls_restr.pdbx_refine_id can be used to distinguish the results
    of joint refinements.
    refine_ls_restr.pdbx_restraint_functionThe functional form of the restraint function used in the least-squares
    refinement.
    refine_ls_restr.typeThe type of the parameter being restrained.
    Explicit sets of data values are provided for the programs
    PROTIN/PROLSQ (beginning with p_) and RESTRAIN (beginning with
    RESTRAIN_). As computer programs change, these data values
    are given as examples, not as an enumeration list. Computer
    programs that convert a data block to a refinement table will
    expect the exact form of the data values given here to be used.
    refine_ls_restr.weightThe weighting value applied to this type of restraint in
    the least-squares refinement.
    reflns.B_iso_Wilson_estimateThe value of the overall isotropic displacement parameter
    estimated from the slope of the Wilson plot.
    reflns.R_free_detailsA description of the method by which a subset of reflections was
    selected for exclusion from refinement so as to be used in the
    calculation of a 'free' R factor.
    reflns.Rmerge_F_allResidual factor Rmerge for all reflections that satisfy the
    resolution limits established by _reflns.d_resolution_high
    and _reflns.d_resolution_low.

    sum~i~(sum~j~|F~j~ - <F>|)
    Rmerge(F) = --------------------------
    sum~i~(sum~j~<F>)

    F~j~ = the amplitude of the jth observation of reflection i
    <F> = the mean of the amplitudes of all observations of
    reflection i

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection
    reflns.Rmerge_F_obsResidual factor Rmerge for reflections that satisfy the
    resolution limits established by _reflns.d_resolution_high
    and _reflns.d_resolution_low and the observation limit
    established by _reflns.observed_criterion.

    sum~i~(sum~j~|F~j~ - <F>|)
    Rmerge(F) = --------------------------
    sum~i~(sum~j~<F>)

    F~j~ = the amplitude of the jth observation of reflection i
    <F> = the mean of the amplitudes of all observations of
    reflection i

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection
    reflns.d_resolution_highThe smallest value in angstroms for the interplanar spacings
    for the reflection data. This is called the highest resolution.
    reflns.d_resolution_lowThe largest value in angstroms for the interplanar spacings
    for the reflection data. This is called the lowest resolution.
    reflns.data_reduction_detailsA description of special aspects of the data-reduction
    procedures.
    reflns.data_reduction_methodThe method used for data reduction.

    Note that this is not the computer program used, which is
    described in the SOFTWARE category, but the method
    itself.

    This data item should be used to describe significant
    methodological options used within the data-reduction programs.
    reflns.detailsA description of reflection data not covered by other data
    names. This should include details of the Friedel pairs.
    reflns.limit_h_maxMaximum value of the Miller index h for the reflection data. This
    need not have the same value as _diffrn_reflns.limit_h_max.
    reflns.limit_h_minMinimum value of the Miller index h for the reflection data. This
    need not have the same value as _diffrn_reflns.limit_h_min.
    reflns.limit_k_maxMaximum value of the Miller index k for the reflection data. This
    need not have the same value as _diffrn_reflns.limit_k_max.
    reflns.limit_k_minMinimum value of the Miller index k for the reflection data. This
    need not have the same value as _diffrn_reflns.limit_k_min.
    reflns.limit_l_maxMaximum value of the Miller index l for the reflection data. This
    need not have the same value as _diffrn_reflns.limit_l_max.
    reflns.limit_l_minMinimum value of the Miller index l for the reflection data. This
    need not have the same value as _diffrn_reflns.limit_l_min.
    reflns.number_allThe total number of reflections in the REFLN list (not the
    DIFFRN_REFLN list). This number may contain Friedel-equivalent
    reflections according to the nature of the structure and the
    procedures used. The item _reflns.details describes the
    reflection data.
    reflns.number_obsThe number of reflections in the REFLN list (not the DIFFRN_REFLN
    list) classified as observed (see _reflns.observed_criterion).
    This number may contain Friedel-equivalent reflections according
    to the nature of the structure and the procedures used.
    reflns.observed_criterionThe criterion used to classify a reflection as 'observed'. This
    criterion is usually expressed in terms of a sigma(I) or
    sigma(F) threshold.
    reflns.observed_criterion_F_maxThe criterion used to classify a reflection as 'observed'
    expressed as an upper limit for the value of F.
    reflns.observed_criterion_F_minThe criterion used to classify a reflection as 'observed'
    expressed as a lower limit for the value of F.
    reflns.observed_criterion_I_maxThe criterion used to classify a reflection as 'observed'
    expressed as an upper limit for the value of I.
    reflns.observed_criterion_I_minThe criterion used to classify a reflection as 'observed'
    expressed as a lower limit for the value of I.
    reflns.observed_criterion_sigma_FThe criterion used to classify a reflection as 'observed'
    expressed as a multiple of the value of sigma(F).
    reflns.observed_criterion_sigma_IThe criterion used to classify a reflection as 'observed'
    expressed as a multiple of the value of sigma(I).
    reflns.pdbx_CC_halfThe Pearson's correlation coefficient expressed as a decimal value
    between the average intensities from randomly selected
    half-datasets.

    Ref: Karplus & Diederichs (2012), Science 336, 1030-33
    reflns.pdbx_R_splitR split measures the agreement between the sets of intensities created by merging
    odd- and even-numbered images from the overall data.

    Ref: T. A. White, R. A. Kirian, A. V. Martin, A. Aquila, K. Nass, A. Barty
    and H. N. Chapman (2012), J. Appl. Cryst. 45, 335-341
    reflns.pdbx_Rmerge_I_obsThe R value for merging intensities satisfying the observed
    criteria in this data set.
    reflns.pdbx_Rpim_I_allThe precision-indicating merging R factor value Rpim,
    for merging all intensities in this data set.

    sum~i~ [1/(N~i~ - 1)]1/2^ sum~j~ | I~j~ - <I~i~> |
    Rpim = --------------------------------------------------
    sum~i~ ( sum~j~ I~j~ )

    I~j~ = the intensity of the jth observation of reflection i
    <I~i~> = the mean of the intensities of all observations
    of reflection i
    N~i~ = the redundancy (the number of times reflection i
    has been measured).

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection.

    Ref: Diederichs, K. & Karplus, P. A. (1997). Nature Struct.
    Biol. 4, 269-275.
    Weiss, M. S. & Hilgenfeld, R. (1997). J. Appl. Cryst.
    30, 203-205.
    Weiss, M. S. (2001). J. Appl. Cryst. 34, 130-135.
    reflns.pdbx_Rrim_I_allThe redundancy-independent merging R factor value Rrim,
    also denoted Rmeas, for merging all intensities in this
    data set.

    sum~i~ [N~i~/(N~i~ - 1)]1/2^ sum~j~ | I~j~ - <I~i~> |
    Rrim = ----------------------------------------------------
    sum~i~ ( sum~j~ I~j~ )

    I~j~ = the intensity of the jth observation of reflection i
    <I~i~> = the mean of the intensities of all observations of
    reflection i
    N~i~ = the redundancy (the number of times reflection i
    has been measured).

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection.

    Ref: Diederichs, K. & Karplus, P. A. (1997). Nature Struct.
    Biol. 4, 269-275.
    Weiss, M. S. & Hilgenfeld, R. (1997). J. Appl. Cryst.
    30, 203-205.
    Weiss, M. S. (2001). J. Appl. Cryst. 34, 130-135.
    reflns.pdbx_Rsym_valueThe R sym value as a decimal number.
    reflns.pdbx_chi_squaredOverall Chi-squared statistic.
    reflns.pdbx_diffrn_idAn identifier for the diffraction data set for this set of summary statistics.

    Multiple diffraction data sets entered as a comma separated list.
    reflns.pdbx_netI_over_av_sigmaIThe ratio of the average intensity to the average uncertainty,
    <I>/<sigma(I)>.
    reflns.pdbx_netI_over_sigmaIThe mean of the ratio of the intensities to their
    standard uncertainties, <I/sigma(I)>.
    reflns.pdbx_number_measured_allTotal number of measured reflections.
    reflns.pdbx_ordinalAn ordinal identifier for this set of reflection statistics.
    reflns.pdbx_redundancyOverall redundancy for this data set.
    reflns.pdbx_scaling_rejectsNumber of reflections rejected in scaling operations.
    reflns.percent_possible_obsThe percentage of geometrically possible reflections represented
    by reflections that satisfy the resolution limits established
    by _reflns.d_resolution_high and _reflns.d_resolution_low and
    the observation limit established by
    _reflns.observed_criterion.
    reflns.phase_calculation_detailsThe value of _reflns.phase_calculation_details describes a
    special details about calculation of phases in _refln.phase_calc.
    reflns_shell.Rmerge_F_allResidual factor Rmerge for all reflections that satisfy the
    resolution limits established by _reflns_shell.d_res_high and
    _reflns_shell.d_res_low.

    sum~i~(sum~j~|F~j~ - <F>|)
    Rmerge(F) = --------------------------
    sum~i~(sum~j~<F>)

    F~j~ = the amplitude of the jth observation of reflection i
    <F> = the mean of the amplitudes of all observations of
    reflection i

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection
    reflns_shell.Rmerge_F_obsResidual factor Rmerge for reflections that satisfy the
    resolution limits established by _reflns_shell.d_res_high and
    _reflns_shell.d_res_low and the observation criterion
    established by _reflns.observed_criterion.

    sum~i~(sum~j~|F~j~ - <F>|)
    Rmerge(F) = --------------------------
    sum~i~(sum~j~<F>)

    F~j~ = the amplitude of the jth observation of reflection i
    <F> = the mean of the amplitudes of all observations of
    reflection i

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection
    reflns_shell.Rmerge_I_allThe value of Rmerge(I) for all reflections in a given shell.

    sum~i~(sum~j~|I~j~ - <I>|)
    Rmerge(I) = --------------------------
    sum~i~(sum~j~<I>)

    I~j~ = the intensity of the jth observation of reflection i
    <I> = the mean of the intensities of all observations of
    reflection i

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection
    reflns_shell.Rmerge_I_obsThe value of Rmerge(I) for reflections classified as 'observed'
    (see _reflns.observed_criterion) in a given shell.

    sum~i~(sum~j~|I~j~ - <I>|)
    Rmerge(I) = --------------------------
    sum~i~(sum~j~<I>)

    I~j~ = the intensity of the jth observation of reflection i
    <I> = the mean of the intensities of all observations of
    reflection i

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection
    reflns_shell.d_res_highThe smallest value in angstroms for the interplanar spacings
    for the reflections in this shell. This is called the highest
    resolution.
    reflns_shell.d_res_lowThe highest value in angstroms for the interplanar spacings
    for the reflections in this shell. This is called the lowest
    resolution.
    reflns_shell.meanI_over_sigI_allThe ratio of the mean of the intensities of all reflections
    in this shell to the mean of the standard uncertainties of the
    intensities of all reflections in this shell.
    reflns_shell.meanI_over_sigI_obsThe ratio of the mean of the intensities of the reflections
    classified as 'observed' (see _reflns.observed_criterion) in
    this shell to the mean of the standard uncertainties of the
    intensities of the 'observed' reflections in this
    shell.
    reflns_shell.meanI_over_uI_allThe ratio of the mean of the intensities of all reflections
    in this shell to the mean of the standard uncertainties of the
    intensities of all reflections in this shell.
    reflns_shell.number_measured_allThe total number of reflections measured for this
    shell.
    reflns_shell.number_measured_obsThe number of reflections classified as 'observed'
    (see _reflns.observed_criterion) for this
    shell.
    reflns_shell.number_possibleThe number of unique reflections it is possible to measure in
    this shell.
    reflns_shell.number_unique_allThe total number of measured reflections which are symmetry-
    unique after merging for this shell.
    reflns_shell.number_unique_obsThe total number of measured reflections classified as 'observed'
    (see _reflns.observed_criterion) which are symmetry-unique
    after merging for this shell.
    reflns_shell.pdbx_CC_halfThe Pearson's correlation coefficient expressed as a decimal value
    between the average intensities from randomly selected
    half-datasets within the resolution shell.

    Ref: Karplus & Diederichs (2012), Science 336, 1030-33
    reflns_shell.pdbx_R_splitR split measures the agreement between the sets of intensities created by merging
    odd- and even-numbered images from the data within the resolution shell.

    Ref: T. A. White, R. A. Kirian, A. V. Martin, A. Aquila, K. Nass,
    A. Barty and H. N. Chapman (2012), J. Appl. Cryst. 45, 335-341
    reflns_shell.pdbx_Rpim_I_allThe precision-indicating merging R factor value Rpim,
    for merging all intensities in a given shell.

    sum~i~ [1/(N~i~ - 1)]1/2^ sum~j~ | I~j~ - <I~i~> |
    Rpim = --------------------------------------------------
    sum~i~ ( sum~j~ I~j~ )

    I~j~ = the intensity of the jth observation of reflection i
    <I~i~> = the mean of the intensities of all observations of
    reflection i
    N~i~ = the redundancy (the number of times reflection i
    has been measured).

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection.

    Ref: Diederichs, K. & Karplus, P. A. (1997). Nature Struct.
    Biol. 4, 269-275.
    Weiss, M. S. & Hilgenfeld, R. (1997). J. Appl. Cryst.
    30, 203-205.
    Weiss, M. S. (2001). J. Appl. Cryst. 34, 130-135.
    reflns_shell.pdbx_Rrim_I_allThe redundancy-independent merging R factor value Rrim,
    also denoted Rmeas, for merging all intensities in a
    given shell.

    sum~i~ [N~i~ /( N~i~ - 1)]1/2^ sum~j~ | I~j~ - <I~i~> |
    Rrim = --------------------------------------------------------
    sum~i~ ( sum~j~ I~j~ )

    I~j~ = the intensity of the jth observation of reflection i
    <I~i~> = the mean of the intensities of all observations of
    reflection i
    N~i~ = the redundancy (the number of times reflection i
    has been measured).

    sum~i~ is taken over all reflections
    sum~j~ is taken over all observations of each reflection.

    Ref: Diederichs, K. & Karplus, P. A. (1997). Nature Struct.
    Biol. 4, 269-275.
    Weiss, M. S. & Hilgenfeld, R. (1997). J. Appl. Cryst.
    30, 203-205.
    Weiss, M. S. (2001). J. Appl. Cryst. 34, 130-135.
    reflns_shell.pdbx_Rsym_valueR sym value in percent.
    reflns_shell.pdbx_chi_squaredChi-squared statistic for this resolution shell.
    reflns_shell.pdbx_diffrn_idAn identifier for the diffraction data set corresponding to this resolution shell.

    Multiple diffraction data sets specified as a comma separated list.
    reflns_shell.pdbx_netI_over_sigmaI_allThe mean of the ratio of the intensities to their
    standard uncertainties of all reflections in the
    resolution shell.

    _reflns_shell.pdbx_netI_over_sigmaI_all = <I/sigma(I)>
    reflns_shell.pdbx_netI_over_sigmaI_obsThe mean of the ratio of the intensities to their
    standard uncertainties of observed reflections
    (see _reflns.observed_criterion) in the resolution shell.

    _reflns_shell.pdbx_netI_over_sigmaI_obs = <I/sigma(I)>
    reflns_shell.pdbx_ordinalAn ordinal identifier for this resolution shell.
    reflns_shell.pdbx_redundancyRedundancy for the current shell.
    reflns_shell.pdbx_rejectsThe number of rejected reflections in the resolution
    shell. Reflections may be rejected from scaling
    by setting the observation criterion,
    _reflns.observed_criterion.
    reflns_shell.percent_possible_allThe percentage of geometrically possible reflections represented
    by all reflections measured for this shell.
    reflns_shell.percent_possible_obsThe percentage of geometrically possible reflections represented
    by reflections classified as 'observed' (see
    _reflns.observed_criterion) for this shell.
    software.citation_idThis data item is a pointer to _citation.id in the CITATION
    category.
    software.classificationThe classification of the program according to its
    major function.
    software.contact_authorThe recognized contact author of the software. This could be
    the original author, someone who has modified the code or
    someone who maintains the code. It should be the person
    most commonly associated with the code.
    software.contact_author_emailThe e-mail address of the person specified in
    _software.contact_author.
    software.dateThe date the software was released.
    software.descriptionDescription of the software.
    software.languageThe major computing language in which the software is
    coded.
    software.locationThe URL for an Internet address at which
    details of the software can be found.
    software.nameThe name of the software.
    software.osThe name of the operating system under which the software
    runs.
    software.pdbx_ordinalAn ordinal index for this category
    software.typeThe classification of the software according to the most
    common types.
    software.versionThe version of the software.
    struct.pdbx_CASP_flagThe item indicates whether the entry is a CASP target, a CASD-NMR target,
    or similar target participating in methods development experiments.
    struct.pdbx_descriptorAn automatically generated descriptor for an NDB structure or
    the unstructured content of the PDB COMPND record.
    struct.pdbx_model_detailsText description of the methodology which produced this
    model structure.
    struct.pdbx_model_type_detailsA description of the type of structure model.
    struct.titleA title for the data block. The author should attempt to convey
    the essence of the structure archived in the CIF in the title,
    and to distinguish this structural result from others.
    struct_keywords.pdbx_keywordsTerms characterizing the macromolecular structure.
    struct_keywords.textKeywords describing this structure.
    symmetry.Int_Tables_numberSpace-group number from International Tables for Crystallography
    Vol. A (2002).
    symmetry.cell_settingThe cell settings for this space-group symmetry.
    symmetry.pdbx_full_space_group_name_H_MUsed for PDB space group:

    Example: 'C 1 2 1' (instead of C 2)
    'P 1 2 1' (instead of P 2)
    'P 1 21 1' (instead of P 21)
    'P 1 1 21' (instead of P 21 -unique C axis)
    'H 3' (instead of R 3 -hexagonal)
    'H 3 2' (instead of R 3 2 -hexagonal)
    symmetry.space_group_name_H_MHermann-Mauguin space-group symbol. Note that the
    Hermann-Mauguin symbol does not necessarily contain complete
    information about the symmetry and the space-group origin. If
    used, always supply the FULL symbol from International Tables
    for Crystallography Vol. A (2002) and indicate the origin and
    the setting if it is not implicit. If there is any doubt that
    the equivalent positions can be uniquely deduced from this
    symbol, specify the _symmetry_equiv.pos_as_xyz or
    _symmetry.space_group_name_Hall data items as well. Leave
    spaces between symbols referring to
    different axes.
    symmetry.space_group_name_HallSpace-group symbol as described by Hall (1981). This symbol
    gives the space-group setting explicitly. Leave spaces between
    the separate components of the symbol.

    Ref: Hall, S. R. (1981). Acta Cryst. A37, 517-525; erratum
    (1981) A37, 921.
    rcsb_idA unique identifier for each object in this entry container.
    rcsb_entry_group_membership.group_idA unique identifier for a group of entries
    rcsb_entry_group_membership.aggregation_methodMethod used to establish group membership
    rcsb_external_references.idID (accession) from external resource linked to this entry.
    rcsb_external_references.typeInternal identifier for external resource.
    rcsb_external_references.linkLink to this entry in external resource.
    rcsb_binding_affinity.comp_idLigand identifier.
    rcsb_binding_affinity.typeBinding affinity measurement given in one of the following types: The concentration constants: IC50: the concentration of ligand that reduces enzyme activity by 50%; EC50: the concentration of compound that generates a half-maximal response; The binding constant: Kd: dissociation constant; Ka: association constant; Ki: enzyme inhibition constant; The thermodynamic parameters: delta G: Gibbs free energy of binding (for association reaction); delta H: change in enthalpy associated with a chemical reaction; delta S: change in entropy associated with a chemical reaction.
    rcsb_binding_affinity.valueBinding affinity value between a ligand and its target molecule.
    rcsb_binding_affinity.unitBinding affinity unit. Dissociation constant Kd is normally in molar units (or millimolar , micromolar, nanomolar, etc). Association constant Ka is normally expressed in inverse molar units (e.g. M-1).
    rcsb_binding_affinity.symbolBinding affinity symbol indicating approximate or precise strength of the binding.
    rcsb_binding_affinity.reference_sequence_identityData point provided by BindingDB. Percent identity between PDB sequence and reference sequence.
    rcsb_binding_affinity.provenance_codeThe resource name for the related binding affinity reference.
    rcsb_binding_affinity.linkLink to external resource referencing the data.

    Assembly Attributes

    Attribute Description
    pdbx_struct_assembly.detailsA description of special aspects of the macromolecular assembly.

    In the PDB, 'representative helical assembly', 'complete point assembly',
    'complete icosahedral assembly', 'software_defined_assembly', 'author_defined_assembly',
    and 'author_and_software_defined_assembly' are considered "biologically relevant assemblies.
    pdbx_struct_assembly.idThe value of _pdbx_struct_assembly.id must uniquely identify a record in
    the PDBX_STRUCT_ASSEMBLY list.
    pdbx_struct_assembly.method_detailsProvides details of the method used to determine or
    compute the assembly.
    pdbx_struct_assembly.oligomeric_countThe number of polymer molecules in the assembly.
    pdbx_struct_assembly.oligomeric_detailsProvides the details of the oligomeric state of the assembly.
    pdbx_struct_assembly.rcsb_candidate_assemblyCandidate macromolecular assembly.

    Excludes the following cases classified in pdbx_struct_asembly.details:

    'crystal asymmetric unit', 'crystal asymmetric unit, crystal frame', 'helical asymmetric unit',
    'helical asymmetric unit, std helical frame','icosahedral 23 hexamer', 'icosahedral asymmetric unit',
    'icosahedral asymmetric unit, std point frame','icosahedral pentamer', 'pentasymmetron capsid unit',
    'point asymmetric unit', 'point asymmetric unit, std point frame','trisymmetron capsid unit',
    and 'deposited_coordinates'.
    pdbx_struct_assembly.rcsb_detailsA filtered description of the macromolecular assembly.
    pdbx_struct_assembly_auth_evidence.assembly_idThis item references an assembly in pdbx_struct_assembly
    pdbx_struct_assembly_auth_evidence.detailsProvides any additional information regarding the evidence of this assembly
    pdbx_struct_assembly_auth_evidence.experimental_supportProvides the experimental method to determine the state of this assembly
    pdbx_struct_assembly_auth_evidence.idIdentifies a unique record in pdbx_struct_assembly_auth_evidence.
    pdbx_struct_assembly_gen.assembly_idThis data item is a pointer to _pdbx_struct_assembly.id in the
    PDBX_STRUCT_ASSEMBLY category.
    pdbx_struct_assembly_gen.asym_id_listThis data item is a pointer to _struct_asym.id in
    the STRUCT_ASYM category.

    This item may be expressed as a comma separated list of identifiers.
    pdbx_struct_assembly_gen.oper_expressionIdentifies the operation of collection of operations
    from category PDBX_STRUCT_OPER_LIST.

    Operation expressions may have the forms:

    (1) the single operation 1
    (1,2,5) the operations 1, 2, 5
    (1-4) the operations 1,2,3 and 4
    (1,2)(3,4) the combinations of operations
    3 and 4 followed by 1 and 2 (i.e.
    the cartesian product of parenthetical
    groups applied from right to left)
    pdbx_struct_assembly_gen.ordinalThis data item is an ordinal index for the
    PDBX_STRUCT_ASSEMBLY category.
    pdbx_struct_assembly_prop.assembly_idThe identifier for the assembly used in category PDBX_STRUCT_ASSEMBLY.
    pdbx_struct_assembly_prop.biol_idThe identifier for the assembly used in category PDBX_STRUCT_ASSEMBLY.
    pdbx_struct_assembly_prop.typeThe property type for the assembly.
    pdbx_struct_assembly_prop.valueThe value of the assembly property.
    pdbx_struct_oper_list.idThis identifier code must uniquely identify a
    record in the PDBX_STRUCT_OPER_LIST list.
    pdbx_struct_oper_list.matrix_1_1The [1][1] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_1_2The [1][2] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_1_3The [1][3] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_2_1The [2][1] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_2_2The [2][2] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_2_3The [2][3] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_3_1The [3][1] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_3_2The [3][2] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.matrix_3_3The [3][3] element of the 3x3 matrix component of the
    transformation operation.
    pdbx_struct_oper_list.nameA descriptive name for the transformation operation.
    pdbx_struct_oper_list.symmetry_operationThe symmetry operation corresponding to the transformation operation.
    pdbx_struct_oper_list.typeA code to indicate the type of operator.
    pdbx_struct_oper_list.vector_1The [1] element of the three-element vector component of the
    transformation operation.
    pdbx_struct_oper_list.vector_2The [2] element of the three-element vector component of the
    transformation operation.
    pdbx_struct_oper_list.vector_3The [3] element of the three-element vector component of the
    transformation operation.
    rcsb_assembly_container_identifiers.assembly_idAssembly identifier for the container.
    rcsb_assembly_container_identifiers.entry_idEntry identifier for the container.
    rcsb_assembly_container_identifiers.rcsb_idA unique identifier for each object in this assembly container formed by
    a dash separated concatenation of entry and assembly identifiers.
    rcsb_assembly_container_identifiers.interface_ids
    rcsb_assembly_info.assembly_idEntity identifier for the container.
    rcsb_assembly_info.atom_countThe assembly non-hydrogen atomic coordinate count.
    rcsb_assembly_info.branched_atom_countThe assembly non-hydrogen branched entity atomic coordinate count.
    rcsb_assembly_info.branched_entity_countThe number of distinct branched entities in the generated assembly.
    rcsb_assembly_info.branched_entity_instance_countThe number of branched instances in the generated assembly data set.
    This is the total count of branched entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.deuterated_water_countThe assembly deuterated water molecule count.
    rcsb_assembly_info.entry_idThe PDB entry accession code.
    rcsb_assembly_info.hydrogen_atom_countThe assembly hydrogen atomic coordinate count.
    rcsb_assembly_info.modeled_polymer_monomer_countThe number of modeled polymer monomers in the assembly coordinate data.
    This is the total count of monomers with reported coordinate data for all polymer
    entity instances in the generated assembly coordinate data.
    rcsb_assembly_info.na_polymer_entity_typesNucleic acid polymer entity type categories describing the generated assembly.
    rcsb_assembly_info.nonpolymer_atom_countThe assembly non-hydrogen non-polymer entity atomic coordinate count.
    rcsb_assembly_info.nonpolymer_entity_countThe number of distinct non-polymer entities in the generated assembly exclusive of solvent.
    rcsb_assembly_info.nonpolymer_entity_instance_countThe number of non-polymer instances in the generated assembly data set exclusive of solvent.
    This is the total count of non-polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_atom_countThe assembly non-hydrogen polymer entity atomic coordinate count.
    rcsb_assembly_info.polymer_compositionCategories describing the polymer entity composition for the generated assembly.
    rcsb_assembly_info.polymer_entity_countThe number of distinct polymer entities in the generated assembly.
    rcsb_assembly_info.polymer_entity_count_DNAThe number of distinct DNA polymer entities in the generated assembly.
    rcsb_assembly_info.polymer_entity_count_RNAThe number of distinct RNA polymer entities in the generated assembly.
    rcsb_assembly_info.polymer_entity_count_nucleic_acidThe number of distinct nucleic acid polymer entities (DNA or RNA) in the generated assembly.
    rcsb_assembly_info.polymer_entity_count_nucleic_acid_hybridThe number of distinct hybrid nucleic acid polymer entities in the generated assembly.
    rcsb_assembly_info.polymer_entity_count_proteinThe number of distinct protein polymer entities in the generated assembly.
    rcsb_assembly_info.polymer_entity_instance_countThe number of polymer instances in the generated assembly data set.
    This is the total count of polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_entity_instance_count_DNAThe number of DNA polymer instances in the generated assembly data set.
    This is the total count of DNA polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_entity_instance_count_RNAThe number of RNA polymer instances in the generated assembly data set.
    This is the total count of RNA polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_entity_instance_count_nucleic_acidThe number of nucleic acid polymer instances in the generated assembly data set.
    This is the total count of nucleic acid polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_entity_instance_count_nucleic_acid_hybridThe number of hybrid nucleic acide polymer instances in the generated assembly data set.
    This is the total count of hybrid nucleic acid polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_entity_instance_count_proteinThe number of protein polymer instances in the generated assembly data set.
    This is the total count of protein polymer entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.polymer_monomer_countThe number of polymer monomers in sample entity instances comprising the assembly data set.
    This is the total count of monomers for all polymer entity instances
    in the generated assembly coordinate data.
    rcsb_assembly_info.selected_polymer_entity_typesSelected polymer entity type categories describing the generated assembly.
    rcsb_assembly_info.solvent_atom_countThe assembly non-hydrogen solvent atomic coordinate count.
    rcsb_assembly_info.solvent_entity_countThe number of distinct solvent entities in the generated assembly.
    rcsb_assembly_info.solvent_entity_instance_countThe number of solvent instances in the generated assembly data set.
    This is the total count of solvent entity instances generated in the assembly coordinate data.
    rcsb_assembly_info.unmodeled_polymer_monomer_countThe number of unmodeled polymer monomers in the assembly coordinate data. This is
    the total count of monomers with unreported coordinate data for all polymer
    entity instances in the generated assembly coordinate data.
    rcsb_assembly_info.num_interfacesNumber of geometrically equivalent (i.e. same asym_ids on either side) polymer-polymer interfaces in the assembly
    rcsb_assembly_info.num_interface_entitiesNumber of polymer-polymer interface entities, grouping equivalent interfaces at the entity level (i.e. same entity_ids on either side, with similar but not identical binding sites)
    rcsb_assembly_info.num_homomeric_interface_entitiesNumber of homomeric (both partners are the same polymeric entity) interface entities
    rcsb_assembly_info.num_heteromeric_interface_entitiesNumber of heteromeric (both partners are different polymeric entities) interface entities
    rcsb_assembly_info.num_isologous_interface_entitiesNumber of isologous (both binding sites are same, i.e. interface is symmetric) interface entities
    rcsb_assembly_info.num_heterologous_interface_entitiesNumber of heterologous (both binding sites are different) interface entities
    rcsb_assembly_info.num_protein_interface_entitiesNumber of protein-protein interface entities
    rcsb_assembly_info.num_na_interface_entitiesNumber of nucleic acid-nucleic acid interface entities
    rcsb_assembly_info.num_prot-na_interface_entitiesNumber of protein-nucleic acid interface entities
    rcsb_assembly_info.total_assembly_buried_surface_areaTotal buried surface area calculated as the sum of buried surface areas over all interfaces
    rcsb_assembly_info.total_number_interface_residuesTotal number of interfacing residues in the assembly, calculated as the sum of interfacing residues over all interfaces
    rcsb_idA unique identifier for each object in this assembly container formed by
    a dash separated concatenation of entry and assembly identifiers.
    rcsb_struct_symmetry.symbolSymmetry symbol refers to point group or helical symmetry of identical polymeric subunits in Schönflies notation. Contains point group symbol (e.g., C2, C5, D2, T, O, I) or H for helical symmetry.
    rcsb_struct_symmetry.typeSymmetry type refers to point group or helical symmetry of identical polymeric subunits. Contains point group types (e.g. Cyclic, Dihedral) or Helical for helical symmetry.
    rcsb_struct_symmetry.stoichiometryEach type of different subunits is assigned a latter. The number of equivalent subunits is added as a coefficient after each letter (except 1 which is not added explicitly).
    rcsb_struct_symmetry.oligomeric_stateOligomeric state refers to a composition of polymeric subunits in quaternary structure. Quaternary structure may be composed either exclusively of several copies of identical subunits, in which case they are termed homo-oligomers, or alternatively by at least one copy of different subunits (hetero-oligomers). Quaternary structure composed of a single subunit is denoted as 'Monomer'.
    rcsb_struct_symmetry.clusters.members.asym_idInternal chain ID used in mmCIF files to uniquely identify structural elements in the asymmetric unit.
    rcsb_struct_symmetry.clusters.members.pdbx_struct_oper_list_ids
    rcsb_struct_symmetry.clusters.avg_rmsdAverage RMSD between members of a given cluster.
    rcsb_struct_symmetry.rotation_axes.startcoordinate
    rcsb_struct_symmetry.rotation_axes.endcoordinate
    rcsb_struct_symmetry.rotation_axes.orderThe number of times (order of rotation) that a subunit can be repeated by a rotation operation, being transformed into a new state indistinguishable from its starting state.
    rcsb_struct_symmetry.kindThe granularity at which the symmetry calculation is performed. In 'Global Symmetry' all polymeric subunits in assembly are used. In 'Local Symmetry' only a subset of polymeric subunits is considered. In 'Pseudo Symmetry' the threshold for subunits similarity is relaxed.
    rcsb_struct_symmetry_provenance_codeThe title and version of software package used for symmetry calculations.
    rcsb_struct_symmetry_lineage.idAutomatically assigned ID to uniquely identify the symmetry term in the Protein Symmetry Browser.
    rcsb_struct_symmetry_lineage.nameA human-readable term describing protein symmetry.
    rcsb_struct_symmetry_lineage.depthHierarchy depth.
    rcsb_assembly_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_assembly_feature.descriptionA description for the feature.
    rcsb_assembly_feature.feature_idAn identifier for the feature.
    rcsb_assembly_feature.nameA name for the feature.
    rcsb_assembly_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_assembly_feature.typeA type or category of the feature.
    rcsb_assembly_feature.feature_positions.beg_seq_idAn identifier for the monomer at which this segment of the feature begins.
    rcsb_assembly_feature.feature_positions.end_seq_idAn identifier for the monomer at which this segment of the feature ends.
    rcsb_assembly_feature.feature_positions.valuesThe value(s) of the feature over the monomer segment.
    rcsb_assembly_feature.feature_positions.asym_idAn identifier of polymer chain (label_asym_id) corresponding to the feature assignment.
    rcsb_assembly_feature.feature_positions.struct_oper_listIdentifies the list of operations from the category pdbx_struct_oper_list. One item in array per operator applied. The order follows how operators are applied.
    rcsb_assembly_feature.additional_properties.nameThe additional property name.
    rcsb_assembly_feature.additional_properties.values
    rcsb_assembly_feature.additional_properties.values
    rcsb_assembly_feature.additional_properties.values
    rcsb_assembly_annotation.annotation_idAn identifier for the annotation.
    rcsb_assembly_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_assembly_annotation.descriptionA description for the annotation.
    rcsb_assembly_annotation.nameA name for the annotation.
    rcsb_assembly_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_assembly_annotation.typeA type or category of the annotation.
    rcsb_assembly_annotation.additional_properties.nameThe additional property name.
    rcsb_assembly_annotation.additional_properties.values
    rcsb_assembly_annotation.additional_properties.values
    rcsb_assembly_annotation.additional_properties.values
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Polymer Entity Attributes

    Attribute Description
    rcsb_cluster_membership.cluster_idIdentifier for a cluster at the specified level of sequence identity within the cluster data set.
    rcsb_cluster_membership.identitySequence identity expressed as an integer percent value.
    entity_poly.nstd_linkageA flag to indicate whether the polymer contains at least
    one monomer-to-monomer link different from that implied by
    _entity_poly.type.
    entity_poly.nstd_monomerA flag to indicate whether the polymer contains at least
    one monomer that is not considered standard.
    entity_poly.pdbx_seq_one_letter_codeSequence of protein or nucleic acid polymer in standard one-letter
    codes of amino acids or nucleotides. Non-standard amino
    acids/nucleotides are represented by their Chemical
    Component Dictionary (CCD) codes in
    parenthesis. Deoxynucleotides are represented by the
    specially-assigned 2-letter CCD codes in parenthesis,
    with 'D' prefix added to their ribonucleotide
    counterparts. For hybrid polymer, each residue is
    represented by the code of its individual type. A
    cyclic polymer is represented in linear sequence from
    the chosen start to end.

    A for Alanine or Adenosine-5'-monophosphate
    C for Cysteine or Cytidine-5'-monophosphate
    D for Aspartic acid
    E for Glutamic acid
    F for Phenylalanine
    G for Glycine or Guanosine-5'-monophosphate
    H for Histidine
    I for Isoleucine or Inosinic Acid
    L for Leucine
    K for Lysine
    M for Methionine
    N for Asparagine or Unknown ribonucleotide
    O for Pyrrolysine
    P for Proline
    Q for Glutamine
    R for Arginine
    S for Serine
    T for Threonine
    U for Selenocysteine or Uridine-5'-monophosphate
    V for Valine
    W for Tryptophan
    Y for Tyrosine
    (DA) for 2'-deoxyadenosine-5'-monophosphate
    (DC) for 2'-deoxycytidine-5'-monophosphate
    (DG) for 2'-deoxyguanosine-5'-monophosphate
    (DT) for Thymidine-5'-monophosphate
    (MSE) for Selenomethionine
    (SEP) for Phosphoserine
    (TPO) for Phosphothreonine
    (PTR) for Phosphotyrosine
    (PCA) for Pyroglutamic acid
    (UNK) for Unknown amino acid
    (ACE) for Acetylation cap
    (NH2) for Amidation cap
    entity_poly.pdbx_seq_one_letter_code_canCanonical sequence of protein or nucleic acid polymer in standard
    one-letter codes of amino acids or nucleotides,
    corresponding to the sequence in
    _entity_poly.pdbx_seq_one_letter_code. Non-standard
    amino acids/nucleotides are represented by the codes of
    their parents if parent is specified in
    _chem_comp.mon_nstd_parent_comp_id, or by letter 'X' if
    parent is not specified. Deoxynucleotides are
    represented by their canonical one-letter codes of A,
    C, G, or T.

    For modifications with several parent amino acids,
    all corresponding parent amino acid codes will be listed
    (ex. chromophores).
    entity_poly.pdbx_sequence_evidence_codeEvidence for the assignment of the polymer sequence.
    entity_poly.pdbx_strand_idThe PDB strand/chain id(s) corresponding to this polymer entity.
    entity_poly.pdbx_target_identifierFor Structural Genomics entries, the sequence's target identifier registered at the TargetTrack database.
    entity_poly.rcsb_artifact_monomer_countNumber of regions in the sample sequence identified as expression tags, linkers, or
    cloning artifacts.
    entity_poly.rcsb_conflict_countNumber of monomer conflicts relative to the reference sequence.
    entity_poly.rcsb_deletion_countNumber of monomer deletions relative to the reference sequence.
    entity_poly.rcsb_entity_polymer_typeA coarse-grained polymer entity type.
    entity_poly.rcsb_insertion_countNumber of monomer insertions relative to the reference sequence.
    entity_poly.rcsb_mutation_countNumber of engineered mutations engineered in the sample sequence.
    entity_poly.rcsb_non_std_monomer_countNumber of non-standard monomers in the sample sequence.
    entity_poly.rcsb_non_std_monomersUnique list of non-standard monomer chemical component identifiers in the sample sequence.
    entity_poly.rcsb_prd_idFor polymer BIRD molecules the BIRD identifier for the entity.
    entity_poly.rcsb_sample_sequence_lengthThe monomer length of the sample sequence.
    entity_poly.typeThe type of the polymer.
    entity_src_gen.expression_system_idA unique identifier for the expression system. This
    should be extracted from a local list of expression
    systems.
    entity_src_gen.gene_src_common_nameThe common name of the natural organism from which the gene was
    obtained.
    entity_src_gen.gene_src_detailsA description of special aspects of the natural organism from
    which the gene was obtained.
    entity_src_gen.gene_src_genusThe genus of the natural organism from which the gene was
    obtained.
    entity_src_gen.gene_src_speciesThe species of the natural organism from which the gene was
    obtained.
    entity_src_gen.gene_src_strainThe strain of the natural organism from which the gene was
    obtained, if relevant.
    entity_src_gen.gene_src_tissueThe tissue of the natural organism from which the gene was
    obtained.
    entity_src_gen.gene_src_tissue_fractionThe subcellular fraction of the tissue of the natural organism
    from which the gene was obtained.
    entity_src_gen.host_org_common_nameThe common name of the organism that served as host for the
    production of the entity. Where full details of the protein
    production are available it would be expected that this item
    be derived from _entity_src_gen_express.host_org_common_name
    or via _entity_src_gen_express.host_org_tax_id
    entity_src_gen.host_org_detailsA description of special aspects of the organism that served as
    host for the production of the entity. Where full details of
    the protein production are available it would be expected that
    this item would derived from _entity_src_gen_express.host_org_details
    entity_src_gen.host_org_genusThe genus of the organism that served as host for the production
    of the entity.
    entity_src_gen.host_org_speciesThe species of the organism that served as host for the
    production of the entity.
    entity_src_gen.pdbx_alt_source_flagThis data item identifies cases in which an alternative source
    modeled.
    entity_src_gen.pdbx_beg_seq_numThe beginning polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    entity_src_gen.pdbx_descriptionInformation on the source which is not given elsewhere.
    entity_src_gen.pdbx_end_seq_numThe ending polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    entity_src_gen.pdbx_gene_src_atccAmerican Type Culture Collection tissue culture number.
    entity_src_gen.pdbx_gene_src_cellCell type.
    entity_src_gen.pdbx_gene_src_cell_lineThe specific line of cells.
    entity_src_gen.pdbx_gene_src_cellular_locationIdentifies the location inside (or outside) the cell.
    entity_src_gen.pdbx_gene_src_fragmentA domain or fragment of the molecule.
    entity_src_gen.pdbx_gene_src_geneIdentifies the gene.
    entity_src_gen.pdbx_gene_src_ncbi_taxonomy_idNCBI Taxonomy identifier for the gene source organism.

    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    entity_src_gen.pdbx_gene_src_organOrganized group of tissues that carries on a specialized function.
    entity_src_gen.pdbx_gene_src_organelleOrganized structure within cell.
    entity_src_gen.pdbx_gene_src_scientific_nameScientific name of the organism.
    entity_src_gen.pdbx_gene_src_variantIdentifies the variant.
    entity_src_gen.pdbx_host_org_atccAmerical Tissue Culture Collection of the expression system. Where
    full details of the protein production are available it would
    be expected that this item would be derived from
    _entity_src_gen_express.host_org_culture_collection
    entity_src_gen.pdbx_host_org_cellCell type from which the gene is derived. Where
    entity.target_id is provided this should be derived from
    details of the target.
    entity_src_gen.pdbx_host_org_cell_lineA specific line of cells used as the expression system. Where
    full details of the protein production are available it would
    be expected that this item would be derived from
    entity_src_gen_express.host_org_cell_line
    entity_src_gen.pdbx_host_org_cellular_locationIdentifies the location inside (or outside) the cell which
    expressed the molecule.
    entity_src_gen.pdbx_host_org_culture_collectionCulture collection of the expression system. Where
    full details of the protein production are available it would
    be expected that this item would be derived somehwere, but
    exactly where is not clear.
    entity_src_gen.pdbx_host_org_geneSpecific gene which expressed the molecule.
    entity_src_gen.pdbx_host_org_ncbi_taxonomy_idNCBI Taxonomy identifier for the expression system organism.

    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    entity_src_gen.pdbx_host_org_organSpecific organ which expressed the molecule.
    entity_src_gen.pdbx_host_org_organelleSpecific organelle which expressed the molecule.
    entity_src_gen.pdbx_host_org_scientific_nameThe scientific name of the organism that served as host for the
    production of the entity. Where full details of the protein
    production are available it would be expected that this item
    would be derived from _entity_src_gen_express.host_org_scientific_name
    or via _entity_src_gen_express.host_org_tax_id
    entity_src_gen.pdbx_host_org_strainThe strain of the organism in which the entity was
    expressed.
    entity_src_gen.pdbx_host_org_tissueThe specific tissue which expressed the molecule. Where full details
    of the protein production are available it would be expected that this
    item would be derived from _entity_src_gen_express.host_org_tissue
    entity_src_gen.pdbx_host_org_tissue_fractionThe fraction of the tissue which expressed the
    molecule.
    entity_src_gen.pdbx_host_org_variantVariant of the organism used as the expression system. Where
    full details of the protein production are available it would
    be expected that this item be derived from
    entity_src_gen_express.host_org_variant or via
    _entity_src_gen_express.host_org_tax_id
    entity_src_gen.pdbx_host_org_vectorIdentifies the vector used. Where full details of the protein
    production are available it would be expected that this item
    would be derived from _entity_src_gen_clone.vector_name.
    entity_src_gen.pdbx_host_org_vector_typeIdentifies the type of vector used (plasmid, virus, or cosmid).
    Where full details of the protein production are available it
    would be expected that this item would be derived from
    _entity_src_gen_express.vector_type.
    entity_src_gen.pdbx_seq_typeThis data item povides additional information about the sequence type.
    entity_src_gen.pdbx_src_idThis data item is an ordinal identifier for entity_src_gen data records.
    entity_src_gen.plasmid_detailsA description of special aspects of the plasmid that produced the
    entity in the host organism. Where full details of the protein
    production are available it would be expected that this item
    would be derived from _pdbx_construct.details of the construct
    pointed to from _entity_src_gen_express.plasmid_id.
    entity_src_gen.plasmid_nameThe name of the plasmid that produced the entity in the host
    organism. Where full details of the protein production are available
    it would be expected that this item would be derived from
    _pdbx_construct.name of the construct pointed to from
    _entity_src_gen_express.plasmid_id.
    entity_src_nat.common_nameThe common name of the organism from which the entity
    was isolated.
    entity_src_nat.detailsA description of special aspects of the organism from which the
    entity was isolated.
    entity_src_nat.genusThe genus of the organism from which the entity was isolated.
    entity_src_nat.pdbx_alt_source_flagThis data item identifies cases in which an alternative source
    modeled.
    entity_src_nat.pdbx_atccAmerical Tissue Culture Collection number.
    entity_src_nat.pdbx_beg_seq_numThe beginning polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    entity_src_nat.pdbx_cellA particular cell type.
    entity_src_nat.pdbx_cell_lineThe specific line of cells.
    entity_src_nat.pdbx_cellular_locationIdentifies the location inside (or outside) the cell.
    entity_src_nat.pdbx_end_seq_numThe ending polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    entity_src_nat.pdbx_fragmentA domain or fragment of the molecule.
    entity_src_nat.pdbx_ncbi_taxonomy_idNCBI Taxonomy identifier for the source organism.

    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    entity_src_nat.pdbx_organOrganized group of tissues that carries on a specialized function.
    entity_src_nat.pdbx_organelleOrganized structure within cell.
    entity_src_nat.pdbx_organism_scientificScientific name of the organism of the natural source.
    entity_src_nat.pdbx_plasmid_detailsDetails about the plasmid.
    entity_src_nat.pdbx_plasmid_nameThe plasmid containing the gene.
    entity_src_nat.pdbx_secretionIdentifies the secretion from which the molecule was isolated.
    entity_src_nat.pdbx_src_idThis data item is an ordinal identifier for entity_src_nat data records.
    entity_src_nat.pdbx_variantIdentifies the variant.
    entity_src_nat.speciesThe species of the organism from which the entity was isolated.
    entity_src_nat.strainThe strain of the organism from which the entity was isolated.
    entity_src_nat.tissueThe tissue of the organism from which the entity was isolated.
    entity_src_nat.tissue_fractionThe subcellular fraction of the tissue of the organism from
    which the entity was isolated.
    pdbx_entity_src_syn.detailsA description of special aspects of the source for the
    synthetic entity.
    pdbx_entity_src_syn.ncbi_taxonomy_idNCBI Taxonomy identifier of the organism from which the sequence of
    the synthetic entity was derived.

    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    pdbx_entity_src_syn.organism_common_nameThe common name of the organism from which the sequence of
    the synthetic entity was derived.
    pdbx_entity_src_syn.organism_scientificThe scientific name of the organism from which the sequence of
    the synthetic entity was derived.
    pdbx_entity_src_syn.pdbx_alt_source_flagThis data item identifies cases in which an alternative source
    modeled.
    pdbx_entity_src_syn.pdbx_beg_seq_numThe beginning polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    pdbx_entity_src_syn.pdbx_end_seq_numThe ending polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    pdbx_entity_src_syn.pdbx_src_idThis data item is an ordinal identifier for pdbx_entity_src_syn data records.
    rcsb_entity_host_organism.beg_seq_numThe beginning polymer sequence position for the polymer section corresponding
    to this host organism.

    A reference to the sequence position in the entity_poly category.
    rcsb_entity_host_organism.common_nameThe common name of the host organism
    rcsb_entity_host_organism.end_seq_numThe ending polymer sequence position for the polymer section corresponding
    to this host organism.

    A reference to the sequence position in the entity_poly category.
    rcsb_entity_host_organism.ncbi_common_namesCommon names associated with this taxonomy code obtained from NCBI Taxonomy Database.

    These names correspond to the taxonomy identifier assigned by the PDB depositor.

    References:

    Sayers EW, Barrett T, Benson DA, Bryant SH, Canese K, Chetvernin V,
    Church DM, DiCuccio M, Edgar R, Federhen S, Feolo M, Geer LY,
    Helmberg W, Kapustin Y, Landsman D, Lipman DJ, Madden TL, Maglott DR,
    Miller V, Mizrachi I, Ostell J, Pruitt KD, Schuler GD, Sequeira E,
    Sherry ST, Shumway M, Sirotkin K, Souvorov A, Starchenko G,
    Tatusova TA, Wagner L, Yaschenko E, Ye J (2009). Database resources
    of the National Center for Biotechnology Information. Nucleic Acids
    Res. 2009 Jan;37(Database issue):D5-15. Epub 2008 Oct 21.

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Sayers EW (2009).
    GenBank. Nucleic Acids Res. 2009 Jan;37(Database issue):D26-31.
    Epub 2008 Oct 21.
    rcsb_entity_host_organism.ncbi_parent_scientific_nameThe parent scientific name in the NCBI taxonomy hierarchy (depth=1) associated with this taxonomy code.

    References:

    Sayers EW, Barrett T, Benson DA, Bryant SH, Canese K, Chetvernin V,
    Church DM, DiCuccio M, Edgar R, Federhen S, Feolo M, Geer LY,
    Helmberg W, Kapustin Y, Landsman D, Lipman DJ, Madden TL, Maglott DR,
    Miller V, Mizrachi I, Ostell J, Pruitt KD, Schuler GD, Sequeira E,
    Sherry ST, Shumway M, Sirotkin K, Souvorov A, Starchenko G,
    Tatusova TA, Wagner L, Yaschenko E, Ye J (2009). Database resources
    of the National Center for Biotechnology Information. Nucleic Acids
    Res. 2009 Jan;37(Database issue):D5-15. Epub 2008 Oct 21.

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Sayers EW (2009).
    GenBank. Nucleic Acids Res. 2009 Jan;37(Database issue):D26-31.
    Epub 2008 Oct 21.
    rcsb_entity_host_organism.ncbi_scientific_nameThe scientific name associated with this taxonomy code aggregated by the NCBI Taxonomy Database.

    This name corresponds to the taxonomy identifier assigned by the PDB depositor.


    References:

    Sayers EW, Barrett T, Benson DA, Bryant SH, Canese K, Chetvernin V,
    Church DM, DiCuccio M, Edgar R, Federhen S, Feolo M, Geer LY,
    Helmberg W, Kapustin Y, Landsman D, Lipman DJ, Madden TL, Maglott DR,
    Miller V, Mizrachi I, Ostell J, Pruitt KD, Schuler GD, Sequeira E,
    Sherry ST, Shumway M, Sirotkin K, Souvorov A, Starchenko G,
    Tatusova TA, Wagner L, Yaschenko E, Ye J (2009). Database resources
    of the National Center for Biotechnology Information. Nucleic Acids
    Res. 2009 Jan;37(Database issue):D5-15. Epub 2008 Oct 21.

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Sayers EW (2009).
    GenBank. Nucleic Acids Res. 2009 Jan;37(Database issue):D26-31.
    Epub 2008 Oct 21.
    rcsb_entity_host_organism.ncbi_taxonomy_idNCBI Taxonomy identifier for the host organism.


    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    rcsb_entity_host_organism.pdbx_src_idAn identifier for an entity segment.
    rcsb_entity_host_organism.provenance_sourceA code indicating the provenance of the host organism.
    rcsb_entity_host_organism.scientific_nameThe scientific name of the host organism
    rcsb_entity_host_organism.taxonomy_lineage.depthMembers of the NCBI Taxonomy lineage as parent taxonomy lineage depth (1-N)
    rcsb_entity_host_organism.taxonomy_lineage.idMembers of the NCBI Taxonomy lineage as parent taxonomy idcodes.
    rcsb_entity_host_organism.taxonomy_lineage.nameMembers of the NCBI Taxonomy lineage as parent taxonomy names.
    rcsb_entity_source_organism.beg_seq_numThe beginning polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    rcsb_entity_source_organism.common_nameThe common name for the source organism assigned by the PDB depositor.
    rcsb_entity_source_organism.end_seq_numThe ending polymer sequence position for the polymer section corresponding
    to this source.

    A reference to the sequence position in the entity_poly category.
    rcsb_entity_source_organism.ncbi_common_namesCommon names associated with this taxonomy code aggregated by the NCBI Taxonomy Database.

    These name correspond to the taxonomy identifier assigned by the PDB depositor.

    References:

    Sayers EW, Barrett T, Benson DA, Bryant SH, Canese K, Chetvernin V,
    Church DM, DiCuccio M, Edgar R, Federhen S, Feolo M, Geer LY,
    Helmberg W, Kapustin Y, Landsman D, Lipman DJ, Madden TL, Maglott DR,
    Miller V, Mizrachi I, Ostell J, Pruitt KD, Schuler GD, Sequeira E,
    Sherry ST, Shumway M, Sirotkin K, Souvorov A, Starchenko G,
    Tatusova TA, Wagner L, Yaschenko E, Ye J (2009). Database resources
    of the National Center for Biotechnology Information. Nucleic Acids
    Res. 2009 Jan;37(Database issue):D5-15. Epub 2008 Oct 21.

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Sayers EW (2009).
    GenBank. Nucleic Acids Res. 2009 Jan;37(Database issue):D26-31.
    Epub 2008 Oct 21.
    rcsb_entity_source_organism.ncbi_parent_scientific_nameA parent scientific name in the NCBI taxonomy hierarchy of the source organism assigned by the PDB depositor.
    For cellular organism this corresponds to a superkingdom (e.g., Archaea, Bacteria, Eukaryota). For viruses this
    corresponds to a clade (e.g. Adnaviria, Bicaudaviridae, Clavaviridae). For other and unclassified entries this
    corresponds to the first level of any taxonomic rank below the root level.

    References:

    Sayers EW, Barrett T, Benson DA, Bryant SH, Canese K, Chetvernin V,
    Church DM, DiCuccio M, Edgar R, Federhen S, Feolo M, Geer LY,
    Helmberg W, Kapustin Y, Landsman D, Lipman DJ, Madden TL, Maglott DR,
    Miller V, Mizrachi I, Ostell J, Pruitt KD, Schuler GD, Sequeira E,
    Sherry ST, Shumway M, Sirotkin K, Souvorov A, Starchenko G,
    Tatusova TA, Wagner L, Yaschenko E, Ye J (2009). Database resources
    of the National Center for Biotechnology Information. Nucleic Acids
    Res. 2009 Jan;37(Database issue):D5-15. Epub 2008 Oct 21.

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Sayers EW (2009).
    GenBank. Nucleic Acids Res. 2009 Jan;37(Database issue):D26-31.
    Epub 2008 Oct 21.
    rcsb_entity_source_organism.ncbi_scientific_nameThe scientific name associated with this taxonomy code aggregated by the NCBI Taxonomy Database.

    This name corresponds to the taxonomy identifier assigned by the PDB depositor.


    References:

    Sayers EW, Barrett T, Benson DA, Bryant SH, Canese K, Chetvernin V,
    Church DM, DiCuccio M, Edgar R, Federhen S, Feolo M, Geer LY,
    Helmberg W, Kapustin Y, Landsman D, Lipman DJ, Madden TL, Maglott DR,
    Miller V, Mizrachi I, Ostell J, Pruitt KD, Schuler GD, Sequeira E,
    Sherry ST, Shumway M, Sirotkin K, Souvorov A, Starchenko G,
    Tatusova TA, Wagner L, Yaschenko E, Ye J (2009). Database resources
    of the National Center for Biotechnology Information. Nucleic Acids
    Res. 2009 Jan;37(Database issue):D5-15. Epub 2008 Oct 21.

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Sayers EW (2009).
    GenBank. Nucleic Acids Res. 2009 Jan;37(Database issue):D26-31.
    Epub 2008 Oct 21.
    rcsb_entity_source_organism.ncbi_taxonomy_idNCBI Taxonomy identifier for the gene source organism assigned by the PDB depositor.

    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    rcsb_entity_source_organism.pdbx_src_idAn identifier for the entity segment.
    rcsb_entity_source_organism.provenance_sourceReference to the provenance of the source organism details for the entity.
    Primary data indicates information obtained from the same source as the structural model.
    UniProt and NCBI are provided as alternate sources of provenance for organism details.
    rcsb_entity_source_organism.scientific_nameThe scientific name of the source organism assigned by the PDB depositor.
    rcsb_entity_source_organism.source_typeThe source type for the entity
    rcsb_entity_source_organism.taxonomy_lineage.depthMembers of the NCBI Taxonomy lineage as parent taxonomy lineage depth (1-N)
    rcsb_entity_source_organism.taxonomy_lineage.idMembers of the NCBI Taxonomy lineage as parent taxonomy idcodes.
    rcsb_entity_source_organism.taxonomy_lineage.nameMemebers of the NCBI Taxonomy lineage as parent taxonomy names.
    rcsb_entity_source_organism.rcsb_gene_name.provenance_sourceA code indicating the provenance of the source organism details for the entity
    rcsb_entity_source_organism.rcsb_gene_name.valueGene name.
    rcsb_polymer_entity.detailsA description of special aspects of the entity.
    rcsb_polymer_entity.formula_weightFormula mass (KDa) of the entity.
    rcsb_polymer_entity.pdbx_descriptionA description of the polymer entity.
    rcsb_polymer_entity.pdbx_ecEnzyme Commission (EC) number(s)
    rcsb_polymer_entity.pdbx_fragmentPolymer entity fragment description(s).
    rcsb_polymer_entity.pdbx_mutationDetails about any polymer entity mutation(s).
    rcsb_polymer_entity.pdbx_number_of_moleculesThe number of molecules of the entity in the entry.
    rcsb_polymer_entity.rcsb_multiple_source_flagA code indicating the entity has multiple biological sources.
    rcsb_polymer_entity.rcsb_source_part_countThe number of biological sources for the polymer entity. Multiple source contributions
    may come from the same organism (taxonomy).
    rcsb_polymer_entity.rcsb_source_taxonomy_countThe number of distinct source taxonomies for the polymer entity. Commonly used to identify chimeric polymers.
    rcsb_polymer_entity.src_methodThe method by which the sample for the polymer entity was produced.
    Entities isolated directly from natural sources (tissues, soil
    samples etc.) are expected to have further information in the
    ENTITY_SRC_NAT category. Entities isolated from genetically
    manipulated sources are expected to have further information in
    the ENTITY_SRC_GEN category.
    rcsb_polymer_entity.rcsb_ec_lineage.depthMembers of the enzyme classification lineage as parent classification hierarchy depth (1-N).
    rcsb_polymer_entity.rcsb_ec_lineage.idMembers of the enzyme classification lineage as parent classification codes.
    rcsb_polymer_entity.rcsb_ec_lineage.nameMembers of the enzyme classification lineage as parent classification names.
    rcsb_polymer_entity.rcsb_macromolecular_names_combined.nameCombined list of macromolecular names.
    rcsb_polymer_entity.rcsb_macromolecular_names_combined.provenance_codeCombined list of macromolecular names associated provenance code.

    ECO (https://github.com/evidenceontology/evidenceontology)
    rcsb_polymer_entity.rcsb_macromolecular_names_combined.provenance_sourceCombined list of macromolecular names associated name source.
    rcsb_polymer_entity.rcsb_enzyme_class_combined.depthThe enzyme classification hierarchy depth (1-N).
    rcsb_polymer_entity.rcsb_enzyme_class_combined.ecCombined list of enzyme class assignments.
    rcsb_polymer_entity.rcsb_enzyme_class_combined.provenance_sourceCombined list of enzyme class associated provenance sources.
    rcsb_polymer_entity.rcsb_polymer_name_combined.namesProtein name annotated by the UniProtKB or macromolecular name assigned by the PDB
    rcsb_polymer_entity.rcsb_polymer_name_combined.provenance_source
    rcsb_polymer_entity_align.provenance_sourceCode identifying the individual, organization or program that
    assigned the reference sequence.
    rcsb_polymer_entity_align.reference_database_accessionReference sequence accession code.
    rcsb_polymer_entity_align.reference_database_isoformReference sequence isoform identifier.
    rcsb_polymer_entity_align.reference_database_nameReference sequence database name.
    rcsb_polymer_entity_align.aligned_regions.entity_beg_seq_idAn identifier for the monomer in the entity sequence at which this segment of the alignment begins.
    rcsb_polymer_entity_align.aligned_regions.lengthAn length of the this segment of the alignment.
    rcsb_polymer_entity_align.aligned_regions.ref_beg_seq_idAn identifier for the monomer in the reference sequence at which this segment of the alignment begins.
    rcsb_polymer_entity_annotation.annotation_idAn identifier for the annotation.
    rcsb_polymer_entity_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_polymer_entity_annotation.descriptionA description for the annotation.
    rcsb_polymer_entity_annotation.nameA name for the annotation.
    rcsb_polymer_entity_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_polymer_entity_annotation.typeA type or category of the annotation.
    rcsb_polymer_entity_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_polymer_entity_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_polymer_entity_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_polymer_entity_annotation.additional_properties.nameThe additional property name.
    rcsb_polymer_entity_annotation.additional_properties.values
    rcsb_polymer_entity_annotation.additional_properties.values
    rcsb_polymer_entity_annotation.additional_properties.values
    rcsb_polymer_entity_container_identifiers.asym_idsInstance identifiers corresponding to copies of the entity in this container.
    rcsb_polymer_entity_container_identifiers.auth_asym_idsAuthor instance identifiers corresponding to copies of the entity in this container.
    rcsb_polymer_entity_container_identifiers.chem_comp_monomersUnique list of monomer chemical component identifiers in the polymer entity in this container.
    rcsb_polymer_entity_container_identifiers.chem_comp_nstd_monomersUnique list of non-standard monomer chemical component identifiers in the polymer entity in this container.
    rcsb_polymer_entity_container_identifiers.chem_ref_def_idThe chemical reference definition identifier for the entity in this container.
    rcsb_polymer_entity_container_identifiers.entity_idEntity identifier for the container.
    rcsb_polymer_entity_container_identifiers.entry_idEntry identifier for the container.
    rcsb_polymer_entity_container_identifiers.prd_idThe BIRD identifier for the entity in this container.
    rcsb_polymer_entity_container_identifiers.rcsb_idA unique identifier for each object in this entity container formed by
    an underscore separated concatenation of entry and entity identifiers.
    rcsb_polymer_entity_container_identifiers.reference_sequence_identifiers.database_accessionReference database accession code
    rcsb_polymer_entity_container_identifiers.reference_sequence_identifiers.database_isoformReference database identifier for the sequence isoform
    rcsb_polymer_entity_container_identifiers.reference_sequence_identifiers.database_nameReference database name
    rcsb_polymer_entity_container_identifiers.reference_sequence_identifiers.entity_sequence_coverageIndicates what fraction of this polymer entity sequence is covered by the reference sequence.
    rcsb_polymer_entity_container_identifiers.reference_sequence_identifiers.provenance_sourceSource of the reference database assignment
    rcsb_polymer_entity_container_identifiers.reference_sequence_identifiers.reference_sequence_coverageIndicates what fraction of the reference sequence is covered by this polymer entity sequence.
    rcsb_polymer_entity_container_identifiers.uniprot_ids
    rcsb_polymer_entity_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_polymer_entity_feature.descriptionA description for the feature.
    rcsb_polymer_entity_feature.feature_idAn identifier for the feature.
    rcsb_polymer_entity_feature.nameA name for the feature.
    rcsb_polymer_entity_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_polymer_entity_feature.reference_schemeCode residue coordinate system for the assigned feature.
    rcsb_polymer_entity_feature.typeA type or category of the feature.
    rcsb_polymer_entity_feature.feature_positions.beg_comp_idAn identifier for the leading monomer corresponding to the feature assignment.
    rcsb_polymer_entity_feature.feature_positions.beg_seq_idAn identifier for the monomer at which this segment of the feature begins.
    rcsb_polymer_entity_feature.feature_positions.end_seq_idAn identifier for the monomer at which this segment of the feature ends.
    rcsb_polymer_entity_feature.feature_positions.valueThe value for the feature over this monomer segment.
    rcsb_polymer_entity_feature.feature_positions.valuesThe value(s) for the feature over this monomer segment.
    rcsb_polymer_entity_feature.additional_properties.nameThe additional property name.
    rcsb_polymer_entity_feature.additional_properties.values
    rcsb_polymer_entity_feature.additional_properties.values
    rcsb_polymer_entity_feature.additional_properties.values
    rcsb_polymer_entity_feature_summary.countThe feature count.
    rcsb_polymer_entity_feature_summary.coverageThe fractional feature coverage relative to the full entity sequence.
    For instance, the fraction of features such as mutations, artifacts or modified monomers
    relative to the length of the entity sequence.
    rcsb_polymer_entity_feature_summary.maximum_lengthThe maximum feature length.
    rcsb_polymer_entity_feature_summary.maximum_valueThe maximum feature value.
    rcsb_polymer_entity_feature_summary.minimum_lengthThe minimum feature length.
    rcsb_polymer_entity_feature_summary.minimum_valueThe minimum feature value.
    rcsb_polymer_entity_feature_summary.typeType or category of the feature.
    rcsb_polymer_entity_keywords.textKeywords describing this polymer entity.
    rcsb_polymer_entity_name_com.nameA common name for the polymer entity.
    rcsb_polymer_entity_name_sys.nameThe systematic name for the polymer entity.
    rcsb_polymer_entity_name_sys.systemThe system used to generate the systematic name of the polymer entity.
    rcsb_related_target_references.related_resource_nameThe related target data resource name.
    rcsb_related_target_references.related_resource_versionThe version of the target data resource.
    rcsb_related_target_references.related_target_idAn identifier for the target sequence in the related data resource.
    rcsb_related_target_references.target_taxonomy_idNCBI Taxonomy identifier for the target organism.

    Reference:

    Wheeler DL, Chappey C, Lash AE, Leipe DD, Madden TL, Schuler GD,
    Tatusova TA, Rapp BA (2000). Database resources of the National
    Center for Biotechnology Information. Nucleic Acids Res 2000 Jan
    1;28(1):10-4

    Benson DA, Karsch-Mizrachi I, Lipman DJ, Ostell J, Rapp BA,
    Wheeler DL (2000). GenBank. Nucleic Acids Res 2000 Jan 1;28(1):15-18.
    rcsb_related_target_references.aligned_target.entity_beg_seq_idThe position of the monomer in the entity sequence at which the alignment begins.
    rcsb_related_target_references.aligned_target.lengthThe length of the alignment.
    rcsb_related_target_references.aligned_target.target_beg_seq_idThe position of the monomer in the target sequence at which the alignment begins.
    rcsb_target_cofactors.binding_assay_valueThe value measured or determined by the assay.
    rcsb_target_cofactors.binding_assay_value_typeThe type of measurement or value determined by the assay.
    rcsb_target_cofactors.cofactor_InChIKeyStandard IUPAC International Chemical Identifier (InChI) descriptor key
    for the cofactor.

    InChI, the IUPAC International Chemical Identifier,
    by Stephen R Heller, Alan McNaught, Igor Pletnev, Stephen Stein and Dmitrii Tchekhovskoi,
    Journal of Cheminformatics, 2015, 7:23
    rcsb_target_cofactors.cofactor_SMILESSimplified molecular-input line-entry system (SMILES) descriptor for the cofactor.

    Weininger D (February 1988). "SMILES, a chemical language and information system. 1.
    Introduction to methodology and encoding rules". Journal of Chemical Information and Modeling. 28 (1): 31-6.

    Weininger D, Weininger A, Weininger JL (May 1989).
    "SMILES. 2. Algorithm for generation of unique SMILES notation",
    Journal of Chemical Information and Modeling. 29 (2): 97-101.
    rcsb_target_cofactors.cofactor_chem_comp_idThe chemical component definition identifier for the cofactor.
    rcsb_target_cofactors.cofactor_descriptionThe cofactor description.
    rcsb_target_cofactors.cofactor_nameThe cofactor name.
    rcsb_target_cofactors.cofactor_prd_idThe BIRD definition identifier for the cofactor.
    rcsb_target_cofactors.cofactor_resource_idIdentifier for the cofactor assigned by the resource.
    rcsb_target_cofactors.mechanism_of_actionMechanism of action describes the biochemical interaction through which the
    cofactor produces a pharmacological effect.
    rcsb_target_cofactors.neighbor_flagA flag to indicate the cofactor is a structural neighbor of this
    entity.
    rcsb_target_cofactors.patent_nosPatent numbers reporting the pharmacology or activity data.
    rcsb_target_cofactors.pubmed_idsPubMed identifiers for literature supporting the pharmacology or activity data.
    rcsb_target_cofactors.resource_nameResource providing target and cofactor data.
    rcsb_target_cofactors.resource_versionVersion of the information distributed by the data resource.
    rcsb_target_cofactors.target_resource_idIdentifier for the target assigned by the resource.
    rcsb_idA unique identifier for each object in this entity container formed by
    an underscore separated concatenation of entry and entity identifiers.
    rcsb_polymer_entity_group_membership.group_idA unique identifier for a group of entities
    rcsb_polymer_entity_group_membership.aggregation_methodMethod used to establish group membership
    rcsb_polymer_entity_group_membership.similarity_cutoffDegree of similarity expressed as a floating-point number
    rcsb_polymer_entity_group_membership.aligned_regions.entity_beg_seq_idAn identifier for the monomer in the entity sequence at which this segment of the alignment begins.
    rcsb_polymer_entity_group_membership.aligned_regions.lengthAn length of the this segment of the alignment.
    rcsb_polymer_entity_group_membership.aligned_regions.ref_beg_seq_idAn identifier for the monomer in the reference sequence at which this segment of the alignment begins.
    rcsb_genomic_lineage.idAutomatically assigned ID that uniquely identifies taxonomy, chromosome or gene in the Genome Location Browser.
    rcsb_genomic_lineage.nameA human-readable term name.
    rcsb_genomic_lineage.depthClassification hierarchy depth.
    rcsb_membrane_lineage.idAutomatically assigned ID for membrane classification term in the Membrane Protein Browser.
    rcsb_membrane_lineage.nameMembrane protein classification term.
    rcsb_membrane_lineage.depthHierarchy depth.
    rcsb_membrane_lineage_provenance_codeMpstruc keyword denotes original annotation, Homology keyword denotes annotation inferred by homology.
    rcsb_cluster_flexibility.linkLink to the associated PDBFlex database entry.
    rcsb_cluster_flexibility.labelStructural flexibility in the cluster (95% sequence identity) where a given entity belongs.
    rcsb_cluster_flexibility.avg_rmsdAverage RMSD refer to average pairwise RMSD (Root Mean Square Deviation of C-alpha atoms) between structures in the cluster (95% sequence identity) where a given entity belongs.
    rcsb_cluster_flexibility.max_rmsdMaximal RMSD refer to maximal pairwise RMSD (Root Mean Square Deviation of C-alpha atoms) between structures in the cluster (95% sequence identity) where a given entity belongs.
    rcsb_cluster_flexibility.provenance_code
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Branched Entity Attributes

    Attribute Description
    pdbx_entity_branch.rcsb_branched_component_countNumber of constituent chemical components in the branched entity.
    pdbx_entity_branch.typeThe type of this branched oligosaccharide.
    pdbx_entity_branch_descriptor.descriptorThis data item contains the descriptor value for this
    entity.
    pdbx_entity_branch_descriptor.programThis data item contains the name of the program
    or library used to compute the descriptor.
    pdbx_entity_branch_descriptor.program_versionThis data item contains the version of the program
    or library used to compute the descriptor.
    pdbx_entity_branch_descriptor.typeThis data item contains the descriptor type.
    rcsb_branched_entity.detailsA description of special aspects of the branched entity.
    rcsb_branched_entity.formula_weightFormula mass (KDa) of the branched entity.
    rcsb_branched_entity.pdbx_descriptionA description of the branched entity.
    rcsb_branched_entity.pdbx_number_of_moleculesThe number of molecules of the branched entity in the entry.
    rcsb_branched_entity_annotation.annotation_idAn identifier for the annotation.
    rcsb_branched_entity_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_branched_entity_annotation.descriptionA description for the annotation.
    rcsb_branched_entity_annotation.nameA name for the annotation.
    rcsb_branched_entity_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_branched_entity_annotation.typeA type or category of the annotation.
    rcsb_branched_entity_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_branched_entity_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_branched_entity_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_branched_entity_container_identifiers.asym_idsInstance identifiers corresponding to copies of the entity in this container.
    rcsb_branched_entity_container_identifiers.auth_asym_idsAuthor instance identifiers corresponding to copies of the entity in this container.
    rcsb_branched_entity_container_identifiers.chem_comp_monomersUnique list of monomer chemical component identifiers in the entity in this container.
    rcsb_branched_entity_container_identifiers.chem_ref_def_idThe chemical reference definition identifier for the entity in this container.
    rcsb_branched_entity_container_identifiers.entity_idEntity identifier for the container.
    rcsb_branched_entity_container_identifiers.entry_idEntry identifier for the container.
    rcsb_branched_entity_container_identifiers.prd_idThe BIRD identifier for the entity in this container.
    rcsb_branched_entity_container_identifiers.rcsb_idA unique identifier for each object in this entity container formed by
    an underscore separated concatenation of entry and entity identifiers.
    rcsb_branched_entity_container_identifiers.reference_identifiers.provenance_sourceSource of the reference resource assignment
    rcsb_branched_entity_container_identifiers.reference_identifiers.resource_accessionReference resource accession code
    rcsb_branched_entity_container_identifiers.reference_identifiers.resource_nameReference resource name
    rcsb_branched_entity_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_branched_entity_feature.descriptionA description for the feature.
    rcsb_branched_entity_feature.feature_idAn identifier for the feature.
    rcsb_branched_entity_feature.nameA name for the feature.
    rcsb_branched_entity_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_branched_entity_feature.reference_schemeCode residue coordinate system for the assigned feature.
    rcsb_branched_entity_feature.typeA type or category of the feature.
    rcsb_branched_entity_feature.feature_positions.beg_comp_idAn identifier for the leading monomer corresponding to the feature assignment.
    rcsb_branched_entity_feature.feature_positions.beg_seq_idAn identifier for the leading monomer position of the feature.
    rcsb_branched_entity_feature.feature_positions.end_seq_idAn identifier for the leading monomer position of the feature.
    rcsb_branched_entity_feature.feature_positions.valueThe value for the feature at this monomer.
    rcsb_branched_entity_feature.additional_properties.nameThe additional property name.
    rcsb_branched_entity_feature.additional_properties.values
    rcsb_branched_entity_feature.additional_properties.values
    rcsb_branched_entity_feature.additional_properties.values
    rcsb_branched_entity_feature_summary.countThe feature count.
    rcsb_branched_entity_feature_summary.coverageThe fractional feature coverage relative to the full branched entity.
    rcsb_branched_entity_feature_summary.maximum_lengthThe maximum feature length.
    rcsb_branched_entity_feature_summary.maximum_valueThe maximum feature value.
    rcsb_branched_entity_feature_summary.minimum_lengthThe minimum feature length.
    rcsb_branched_entity_feature_summary.minimum_valueThe minimum feature value.
    rcsb_branched_entity_feature_summary.typeType or category of the feature.
    rcsb_branched_entity_keywords.textKeywords describing this branched entity.
    rcsb_branched_entity_name_com.nameA common name for the branched entity.
    rcsb_branched_entity_name_sys.nameThe systematic name for the branched entity.
    rcsb_branched_entity_name_sys.systemThe system used to generate the systematic name of the branched entity.
    rcsb_idA unique identifier for each object in this entity container formed by
    an underscore separated concatenation of entry and entity identifiers.
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Non-polymer Entity Attributes

    Attribute Description
    pdbx_entity_nonpoly.comp_idThis data item is a pointer to _chem_comp.id in the CHEM_COMP category.
    pdbx_entity_nonpoly.entity_idThis data item is a pointer to _entity.id in the ENTITY category.
    pdbx_entity_nonpoly.nameA name for the non-polymer entity
    pdbx_entity_nonpoly.rcsb_prd_idFor non-polymer BIRD molecules the BIRD identifier for the entity.
    rcsb_nonpolymer_entity.detailsA description of special aspects of the entity.
    rcsb_nonpolymer_entity.formula_weightFormula mass (KDa) of the entity.
    rcsb_nonpolymer_entity.pdbx_descriptionA description of the nonpolymer entity.
    rcsb_nonpolymer_entity.pdbx_number_of_moleculesThe number of molecules of the nonpolymer entity in the entry.
    rcsb_nonpolymer_entity_annotation.annotation_idAn identifier for the annotation.
    rcsb_nonpolymer_entity_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_nonpolymer_entity_annotation.comp_idNon-polymer(ligand) chemical component identifier for the entity.
    rcsb_nonpolymer_entity_annotation.descriptionA description for the annotation.
    rcsb_nonpolymer_entity_annotation.nameA name for the annotation.
    rcsb_nonpolymer_entity_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_nonpolymer_entity_annotation.typeA type or category of the annotation.
    rcsb_nonpolymer_entity_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_nonpolymer_entity_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_nonpolymer_entity_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_nonpolymer_entity_container_identifiers.asym_idsInstance identifiers corresponding to copies of the entity in this container.
    rcsb_nonpolymer_entity_container_identifiers.auth_asym_idsAuthor instance identifiers corresponding to copies of the entity in this container.
    rcsb_nonpolymer_entity_container_identifiers.chem_ref_def_idThe chemical reference definition identifier for the entity in this container.
    rcsb_nonpolymer_entity_container_identifiers.entity_idEntity identifier for the container.
    rcsb_nonpolymer_entity_container_identifiers.entry_idEntry identifier for the container.
    rcsb_nonpolymer_entity_container_identifiers.nonpolymer_comp_idNon-polymer(ligand) chemical component identifier for the entity in this container.
    rcsb_nonpolymer_entity_container_identifiers.prd_idThe BIRD identifier for the entity in this container.
    rcsb_nonpolymer_entity_container_identifiers.rcsb_idA unique identifier for each object in this entity container formed by
    an underscore separated concatenation of entry and entity identifiers.
    rcsb_nonpolymer_entity_container_identifiers.reference_chemical_identifiers_provenance_sourceSource of the reference database assignment
    rcsb_nonpolymer_entity_container_identifiers.reference_chemical_identifiers_resource_accessionReference resource accession code
    rcsb_nonpolymer_entity_container_identifiers.reference_chemical_identifiers_resource_nameReference resource name
    rcsb_nonpolymer_entity_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_nonpolymer_entity_feature.comp_idNon-polymer(ligand) chemical component identifier for the entity.
    rcsb_nonpolymer_entity_feature.descriptionA description for the feature.
    rcsb_nonpolymer_entity_feature.feature_idAn identifier for the feature.
    rcsb_nonpolymer_entity_feature.nameA name for the feature.
    rcsb_nonpolymer_entity_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_nonpolymer_entity_feature.typeA type or category of the feature.
    rcsb_nonpolymer_entity_feature.valueThe feature value.
    rcsb_nonpolymer_entity_feature.additional_properties.nameThe additional property name.
    rcsb_nonpolymer_entity_feature.additional_properties.values
    rcsb_nonpolymer_entity_feature.additional_properties.values
    rcsb_nonpolymer_entity_feature.additional_properties.values
    rcsb_nonpolymer_entity_feature_summary.comp_idNon-polymer(ligand) chemical component identifier for the entity.
    rcsb_nonpolymer_entity_feature_summary.countThe feature count.
    rcsb_nonpolymer_entity_feature_summary.maximum_lengthThe maximum feature length.
    rcsb_nonpolymer_entity_feature_summary.maximum_valueThe maximum feature value.
    rcsb_nonpolymer_entity_feature_summary.minimum_lengthThe minimum feature length.
    rcsb_nonpolymer_entity_feature_summary.minimum_valueThe minimum feature value.
    rcsb_nonpolymer_entity_feature_summary.typeType or category of the feature.
    rcsb_nonpolymer_entity_keywords.textKeywords describing this non-polymer entity.
    rcsb_nonpolymer_entity_name_com.nameA common name for the nonpolymer entity.
    rcsb_idA unique identifier for each object in this entity container formed by
    an underscore separated concatenation of entry and entity identifiers.
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Polymer Instance Attributes

    Attribute Description
    pdbx_struct_special_symmetry.PDB_model_numPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.pdbx_PDB_model_num in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.auth_seq_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.auth_seq_id in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.idThe value of _pdbx_struct_special_symmetry.id must uniquely identify
    each item in the PDBX_STRUCT_SPECIAL_SYMMETRY list.

    This is an integer serial number.
    pdbx_struct_special_symmetry.label_asym_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.label_comp_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    pdbx_vrpt_summary_entity_fit_to_map.PDB_model_numThe unique model number from _atom_site.pdbx_PDB_model_num.
    pdbx_vrpt_summary_entity_fit_to_map.Q_scoreThe calculated average Q-score.
    pdbx_vrpt_summary_entity_fit_to_map.average_residue_inclusionThe average of the residue inclusions for all residues in this instance
    pdbx_vrpt_summary_entity_geometry.PDB_model_numThe unique model number from _atom_site.pdbx_PDB_model_num.
    pdbx_vrpt_summary_entity_geometry.angles_RMSZThe overall root mean square of the Z-score for deviations of bond angles in comparison to
    "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    pdbx_vrpt_summary_entity_geometry.average_residue_inclusionThe average of the residue inclusions for all residues in this instance
    pdbx_vrpt_summary_entity_geometry.bonds_RMSZThe overall root mean square of the Z-score for deviations of bond lengths in comparison to
    "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    pdbx_vrpt_summary_entity_geometry.num_angles_RMSZThe number of bond angles compared to "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    pdbx_vrpt_summary_entity_geometry.num_bonds_RMSZThe number of bond lengths compared to "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    rcsb_ligand_neighbors.alt_idAlternate conformer identifier for the target instance.
    rcsb_ligand_neighbors.atom_idThe atom identifier for the target instance.
    rcsb_ligand_neighbors.auth_seq_idThe author residue index for the target instance.
    rcsb_ligand_neighbors.comp_idComponent identifier for the target instance.
    rcsb_ligand_neighbors.distanceDistance value for this ligand interaction.
    rcsb_ligand_neighbors.ligand_alt_idAlternate conformer identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_asym_idThe entity instance identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_atom_idThe atom identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_comp_idThe chemical component identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_entity_idThe entity identifier for the ligand of interaction.
    rcsb_ligand_neighbors.ligand_is_boundA flag to indicate the nature of the ligand interaction is covalent or metal-coordination.
    rcsb_ligand_neighbors.ligand_model_idModel identifier for the ligand interaction.
    rcsb_ligand_neighbors.seq_idThe sequence position for the target instance.
    rcsb_polymer_entity_instance_container_identifiers.asym_idInstance identifier for this container.
    rcsb_polymer_entity_instance_container_identifiers.auth_asym_idAuthor instance identifier for this container.
    rcsb_polymer_entity_instance_container_identifiers.auth_to_entity_poly_seq_mappingResidue index mappings between author provided and entity polymer sequence positions.

    Author residue indices (auth_seq_num) include insertion codes when present.
    The array indices correspond to the indices (1-based) of the deposited sample
    sequence (entity_poly_seq). Unmodelled residues are represented with a "?" value.
    rcsb_polymer_entity_instance_container_identifiers.entity_idEntity identifier for the container.
    rcsb_polymer_entity_instance_container_identifiers.entry_idEntry identifier for the container.
    rcsb_polymer_entity_instance_container_identifiers.rcsb_idA unique identifier for each object in this entity instance container formed by
    an 'dot' (.) separated concatenation of entry and entity instance identifiers.
    rcsb_polymer_instance_annotation.annotation_idAn identifier for the annotation.
    rcsb_polymer_instance_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_polymer_instance_annotation.descriptionA description for the annotation.
    rcsb_polymer_instance_annotation.nameA name for the annotation.
    rcsb_polymer_instance_annotation.ordinalOrdinal identifier for this category
    rcsb_polymer_instance_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_polymer_instance_annotation.typeA type or category of the annotation.
    rcsb_polymer_instance_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_polymer_instance_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_polymer_instance_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_polymer_instance_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_polymer_instance_feature.descriptionA description for the feature.
    rcsb_polymer_instance_feature.feature_idAn identifier for the feature.
    rcsb_polymer_instance_feature.nameA name for the feature.
    rcsb_polymer_instance_feature.ordinalOrdinal identifier for this category
    rcsb_polymer_instance_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_polymer_instance_feature.reference_schemeCode residue coordinate system for the assigned feature.
    rcsb_polymer_instance_feature.typeA type or category of the feature.
    rcsb_polymer_instance_feature.feature_positions.beg_comp_idAn identifier for the monomer(s) corresponding to the feature assignment.
    rcsb_polymer_instance_feature.feature_positions.beg_seq_idAn identifier for the monomer at which this segment of the feature begins.
    rcsb_polymer_instance_feature.feature_positions.end_seq_idAn identifier for the monomer at which this segment of the feature ends.
    rcsb_polymer_instance_feature.feature_positions.valueThe value of the feature over the monomer segment.
    rcsb_polymer_instance_feature.feature_positions.valuesThe value(s) of the feature over the monomer segment.
    rcsb_polymer_instance_feature.additional_properties.nameThe additional property name.
    rcsb_polymer_instance_feature.additional_properties.values
    rcsb_polymer_instance_feature.additional_properties.values
    rcsb_polymer_instance_feature.additional_properties.values
    rcsb_polymer_instance_feature_summary.countThe feature count per polymer chain.
    rcsb_polymer_instance_feature_summary.coverageThe fractional feature coverage relative to the full entity sequence.
    For instance, the fraction of features such as CATH or SCOP domains, secondary structure elements,
    unobserved residues, or geometrical outliers relative to the length of the entity sequence.
    rcsb_polymer_instance_feature_summary.maximum_lengthThe maximum feature length.
    rcsb_polymer_instance_feature_summary.maximum_valueThe maximum feature value.
    rcsb_polymer_instance_feature_summary.minimum_lengthThe minimum feature length.
    rcsb_polymer_instance_feature_summary.minimum_valueThe minimum feature value.
    rcsb_polymer_instance_feature_summary.typeType or category of the feature.
    rcsb_polymer_struct_conn.connect_typeThe connection type.
    rcsb_polymer_struct_conn.descriptionA description of special details of the connection.
    rcsb_polymer_struct_conn.dist_valueDistance value for this contact.
    rcsb_polymer_struct_conn.idThe value of _rcsb_polymer_struct_conn.id is an identifier for connection.

    Note that this item need not be a number; it can be any unique
    identifier.
    rcsb_polymer_struct_conn.ordinal_idThe value of _rcsb_polymer_struct_conn.id must uniquely identify a record in
    the rcsb_polymer_struct_conn list.
    rcsb_polymer_struct_conn.roleThe chemical or structural role of the interaction
    rcsb_polymer_struct_conn.value_orderThe chemical bond order associated with the specified atoms in
    this contact.
    rcsb_polymer_struct_conn.connect_target.auth_asym_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.auth_asym_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.auth_seq_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.auth_seq_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.label_alt_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_alt_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.label_asym_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.label_atom_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_atom_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.label_comp_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.label_seq_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.connect_target_label_seq_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_target.symmetryDescribes the symmetry operation that should be applied to the
    atom set specified by _rcsb_polymer_struct_conn.label* to generate the
    target of the structure connection.
    rcsb_polymer_struct_conn.connect_partner.label_alt_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_alt_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_partner.label_asym_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_partner.label_atom_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _chem_comp_atom.atom_id in the
    CHEM_COMP_ATOM category.
    rcsb_polymer_struct_conn.connect_partner.label_comp_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_partner.label_seq_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_seq_id in the
    ATOM_SITE category.
    rcsb_polymer_struct_conn.connect_partner.symmetryDescribes the symmetry operation that should be applied to the
    atom set specified by _rcsb_polymer_struct_conn.connect_partner_label* to generate the
    partner in the structure connection.
    struct_asym.pdbx_PDB_idThis data item is a pointer to _atom_site.pdbx_PDB_strand_id the
    ATOM_SITE category.
    struct_asym.pdbx_alt_idThis data item is a pointer to _atom_site.ndb_alias_strand_id the
    ATOM_SITE category.
    struct_asym.pdbx_orderThis data item gives the order of the structural elements in the
    ATOM_SITE category.
    struct_asym.pdbx_typeThis data item describes the general type of the structural elements
    in the ATOM_SITE category.
    rcsb_idA unique identifier for each object in this entity instance container formed by
    an 'dot' (.) separated concatenation of entry and entity instance identifiers.
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Branched Instance Attributes

    Attribute Description
    pdbx_struct_special_symmetry.PDB_model_numPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.pdbx_PDB_model_num in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.auth_seq_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.auth_seq_id in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.idThe value of _pdbx_struct_special_symmetry.id must uniquely identify
    each item in the PDBX_STRUCT_SPECIAL_SYMMETRY list.

    This is an integer serial number.
    pdbx_struct_special_symmetry.label_asym_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.label_comp_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_branched_entity_instance_container_identifiers.asym_idInstance identifier for this container.
    rcsb_branched_entity_instance_container_identifiers.auth_asym_idAuthor instance identifier for this container.
    rcsb_branched_entity_instance_container_identifiers.entity_idEntity identifier for the container.
    rcsb_branched_entity_instance_container_identifiers.entry_idEntry identifier for the container.
    rcsb_branched_entity_instance_container_identifiers.rcsb_idA unique identifier for each object in this entity instance container formed by
    an 'dot' (.) separated concatenation of entry and entity instance identifiers.
    rcsb_branched_instance_annotation.annotation_idAn identifier for the annotation.
    rcsb_branched_instance_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_branched_instance_annotation.comp_idChemical component identifier.
    rcsb_branched_instance_annotation.descriptionA description for the annotation.
    rcsb_branched_instance_annotation.nameA name for the annotation.
    rcsb_branched_instance_annotation.ordinalOrdinal identifier for this category
    rcsb_branched_instance_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_branched_instance_annotation.typeA type or category of the annotation.
    rcsb_branched_instance_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_branched_instance_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_branched_instance_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_branched_instance_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_branched_instance_feature.descriptionA description for the feature.
    rcsb_branched_instance_feature.feature_idAn identifier for the feature.
    rcsb_branched_instance_feature.nameA name for the feature.
    rcsb_branched_instance_feature.ordinalOrdinal identifier for this category
    rcsb_branched_instance_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_branched_instance_feature.reference_schemeCode residue coordinate system for the assigned feature.
    rcsb_branched_instance_feature.typeA type or category of the feature.
    rcsb_branched_instance_feature.feature_positions.beg_comp_idAn identifier for the monomer(s) corresponding to the feature assignment.
    rcsb_branched_instance_feature.feature_positions.beg_seq_idAn identifier for the leading monomer feature position.
    rcsb_branched_instance_feature.feature_positions.end_seq_idAn identifier for the terminal monomer feature position.
    rcsb_branched_instance_feature.feature_positions.valueThe value of the feature at the monomer position.
    rcsb_branched_instance_feature.feature_positions.valuesThe value(s) of the feature at the monomer position.
    rcsb_branched_instance_feature.feature_value.comp_idThe chemical component identifier for the instance of the feature value.
    rcsb_branched_instance_feature.feature_value.detailsSpecific details about the feature.
    rcsb_branched_instance_feature.feature_value.referenceThe reference value of the feature.
    rcsb_branched_instance_feature.feature_value.reportedThe reported value of the feature.
    rcsb_branched_instance_feature.feature_value.uncertainty_estimateThe estimated uncertainty of the reported feature value.
    rcsb_branched_instance_feature.feature_value.uncertainty_estimate_typeThe type of estimated uncertainty for the reported feature value.
    rcsb_branched_instance_feature.additional_properties.nameThe additional property name.
    rcsb_branched_instance_feature.additional_properties.values
    rcsb_branched_instance_feature.additional_properties.values
    rcsb_branched_instance_feature.additional_properties.values
    rcsb_branched_instance_feature_summary.countThe feature count.
    rcsb_branched_instance_feature_summary.coverageThe fractional feature coverage relative to the full branched entity.
    rcsb_branched_instance_feature_summary.maximum_lengthThe maximum feature length.
    rcsb_branched_instance_feature_summary.maximum_valueThe maximum feature value.
    rcsb_branched_instance_feature_summary.minimum_lengthThe minimum feature length.
    rcsb_branched_instance_feature_summary.minimum_valueThe minimum feature value.
    rcsb_branched_instance_feature_summary.typeType or category of the feature.
    rcsb_branched_struct_conn.connect_typeThe connection type.
    rcsb_branched_struct_conn.descriptionA description of special details of the connection.
    rcsb_branched_struct_conn.dist_valueDistance value for this contact.
    rcsb_branched_struct_conn.idThe value of _rcsb_branched_struct_conn.id is an identifier for connection.
    rcsb_branched_struct_conn.ordinal_idThe value of _rcsb_branched_struct_conn.id must uniquely identify a record in
    the rcsb_branched_struct_conn list.
    rcsb_branched_struct_conn.roleThe chemical or structural role of the interaction
    rcsb_branched_struct_conn.value_orderThe chemical bond order associated with the specified atoms in
    this contact.
    rcsb_branched_struct_conn.connect_target.auth_asym_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.auth_asym_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.auth_seq_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.auth_seq_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.label_alt_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_alt_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.label_asym_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.label_atom_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_atom_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.label_comp_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.label_seq_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.connect_target_label_seq_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_target.symmetryDescribes the symmetry operation that should be applied to the
    atom set specified by _rcsb_branched_struct_conn.label* to generate the
    target of the structure connection.
    rcsb_branched_struct_conn.connect_partner.label_alt_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_alt_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_partner.label_asym_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_partner.label_atom_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _chem_comp_atom.atom_id in the
    CHEM_COMP_ATOM category.
    rcsb_branched_struct_conn.connect_partner.label_comp_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_partner.label_seq_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_seq_id in the
    ATOM_SITE category.
    rcsb_branched_struct_conn.connect_partner.symmetryDescribes the symmetry operation that should be applied to the
    atom set specified by _rcsb_branched_struct_conn.connect_partner_label* to generate the
    partner in the structure connection.
    rcsb_ligand_neighbors.alt_idAlternate conformer identifier for the target instance.
    rcsb_ligand_neighbors.atom_idThe atom identifier for the target instance.
    rcsb_ligand_neighbors.auth_seq_idThe author residue index for the target instance.
    rcsb_ligand_neighbors.comp_idComponent identifier for the target instance.
    rcsb_ligand_neighbors.distanceDistance value for this ligand interaction.
    rcsb_ligand_neighbors.ligand_alt_idAlternate conformer identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_asym_idThe entity instance identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_atom_idThe atom identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_comp_idThe chemical component identifier for the ligand interaction.
    rcsb_ligand_neighbors.ligand_entity_idThe entity identifier for the ligand of interaction.
    rcsb_ligand_neighbors.ligand_is_boundA flag to indicate the nature of the ligand interaction is covalent or metal-coordination.
    rcsb_ligand_neighbors.ligand_model_idModel identifier for the ligand interaction.
    rcsb_ligand_neighbors.seq_idThe sequence position for the target instance.
    struct_asym.pdbx_PDB_idThis data item is a pointer to _atom_site.pdbx_PDB_strand_id the
    ATOM_SITE category.
    struct_asym.pdbx_alt_idThis data item is a pointer to _atom_site.ndb_alias_strand_id the
    ATOM_SITE category.
    struct_asym.pdbx_orderThis data item gives the order of the structural elements in the
    ATOM_SITE category.
    struct_asym.pdbx_typeThis data item describes the general type of the structural elements
    in the ATOM_SITE category.
    rcsb_idA unique identifier for each object in this entity instance container formed by
    an 'dot' (.) separated concatenation of entry and entity instance identifiers.
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Non-polymer Instance Attributes

    Attribute Description
    pdbx_struct_special_symmetry.PDB_model_numPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.pdbx_PDB_model_num in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.auth_seq_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.auth_seq_id in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.idThe value of _pdbx_struct_special_symmetry.id must uniquely identify
    each item in the PDBX_STRUCT_SPECIAL_SYMMETRY list.

    This is an integer serial number.
    pdbx_struct_special_symmetry.label_asym_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    pdbx_struct_special_symmetry.label_comp_idPart of the identifier for the molecular component.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    pdbx_vrpt_summary_entity_fit_to_map.PDB_model_numThe unique model number from _atom_site.pdbx_PDB_model_num.
    pdbx_vrpt_summary_entity_fit_to_map.Q_scoreThe calculated average Q-score.
    pdbx_vrpt_summary_entity_fit_to_map.average_residue_inclusionThe average of the residue inclusions for all residues in this instance
    pdbx_vrpt_summary_entity_geometry.PDB_model_numThe unique model number from _atom_site.pdbx_PDB_model_num.
    pdbx_vrpt_summary_entity_geometry.angles_RMSZThe overall root mean square of the Z-score for deviations of bond angles in comparison to
    "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    pdbx_vrpt_summary_entity_geometry.average_residue_inclusionThe average of the residue inclusions for all residues in this instance
    pdbx_vrpt_summary_entity_geometry.bonds_RMSZThe overall root mean square of the Z-score for deviations of bond lengths in comparison to
    "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    pdbx_vrpt_summary_entity_geometry.num_angles_RMSZThe number of bond angles compared to "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    pdbx_vrpt_summary_entity_geometry.num_bonds_RMSZThe number of bond lengths compared to "standard geometry" made using the MolProbity dangle program.
    Standard geometry parameters are taken from Engh and Huber (2001) and Parkinson et al. (1996).
    rcsb_nonpolymer_entity_instance_container_identifiers.asym_idInstance identifier for this container.
    rcsb_nonpolymer_entity_instance_container_identifiers.auth_asym_idAuthor instance identifier for this container.
    rcsb_nonpolymer_entity_instance_container_identifiers.auth_seq_idResidue number for non-polymer entity instance.
    rcsb_nonpolymer_entity_instance_container_identifiers.comp_idComponent identifier for non-polymer entity instance.
    rcsb_nonpolymer_entity_instance_container_identifiers.entity_idEntity identifier for the container.
    rcsb_nonpolymer_entity_instance_container_identifiers.entry_idEntry identifier for the container.
    rcsb_nonpolymer_entity_instance_container_identifiers.rcsb_idA unique identifier for each object in this entity instance container formed by
    an 'dot' (.) separated concatenation of entry and entity instance identifiers.
    rcsb_nonpolymer_instance_annotation.annotation_idAn identifier for the annotation.
    rcsb_nonpolymer_instance_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_nonpolymer_instance_annotation.comp_idNon-polymer (ligand) chemical component identifier.
    rcsb_nonpolymer_instance_annotation.descriptionA description for the annotation.
    rcsb_nonpolymer_instance_annotation.nameA name for the annotation.
    rcsb_nonpolymer_instance_annotation.ordinalOrdinal identifier for this category
    rcsb_nonpolymer_instance_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_nonpolymer_instance_annotation.typeA type or category of the annotation.
    rcsb_nonpolymer_instance_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_nonpolymer_instance_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_nonpolymer_instance_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_nonpolymer_instance_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_nonpolymer_instance_feature.comp_idComponent identifier for non-polymer entity instance.
    rcsb_nonpolymer_instance_feature.descriptionA description for the feature.
    rcsb_nonpolymer_instance_feature.feature_idAn identifier for the feature.
    rcsb_nonpolymer_instance_feature.nameA name for the feature.
    rcsb_nonpolymer_instance_feature.ordinalOrdinal identifier for this category
    rcsb_nonpolymer_instance_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_nonpolymer_instance_feature.typeA type or category of the feature.
    rcsb_nonpolymer_instance_feature.feature_value.comp_idThe chemical component identifier for the instance of the feature value.
    rcsb_nonpolymer_instance_feature.feature_value.detailsSpecific details about the feature.
    rcsb_nonpolymer_instance_feature.feature_value.referenceThe reference value of the feature.
    rcsb_nonpolymer_instance_feature.feature_value.reportedThe reported value of the feature.
    rcsb_nonpolymer_instance_feature.feature_value.uncertainty_estimateThe estimated uncertainty of the reported feature value.
    rcsb_nonpolymer_instance_feature.feature_value.uncertainty_estimate_typeThe type of estimated uncertainty for the reported feature value.
    rcsb_nonpolymer_instance_feature.additional_properties.nameThe additional property name.
    rcsb_nonpolymer_instance_feature.additional_properties.values
    rcsb_nonpolymer_instance_feature.additional_properties.values
    rcsb_nonpolymer_instance_feature.additional_properties.values
    rcsb_nonpolymer_instance_feature_summary.comp_idComponent identifier for non-polymer entity instance.
    rcsb_nonpolymer_instance_feature_summary.countThe feature count.
    rcsb_nonpolymer_instance_feature_summary.coverageThe fractional feature coverage relative to the full entity sequence.
    rcsb_nonpolymer_instance_feature_summary.maximum_lengthThe maximum feature length.
    rcsb_nonpolymer_instance_feature_summary.maximum_valueThe maximum feature value.
    rcsb_nonpolymer_instance_feature_summary.minimum_lengthThe minimum feature length.
    rcsb_nonpolymer_instance_feature_summary.minimum_valueThe minimum feature value.
    rcsb_nonpolymer_instance_feature_summary.typeType or category of the feature.
    rcsb_nonpolymer_instance_validation_score.RSCCThe real space correlation coefficient (RSCC) for the non-polymer entity instance.
    rcsb_nonpolymer_instance_validation_score.RSRThe real space R-value (RSR) for the non-polymer entity instance.
    rcsb_nonpolymer_instance_validation_score.alt_idAlternate conformer identifier for the non-polymer entity instance.
    rcsb_nonpolymer_instance_validation_score.average_occupancyThe average heavy atom occupancy for coordinate records for the non-polymer entity instance.
    rcsb_nonpolymer_instance_validation_score.completenessThe reported fraction of atomic coordinate records for the non-polymer entity instance.
    rcsb_nonpolymer_instance_validation_score.intermolecular_clashesThe number of intermolecular MolProbity clashes cacluated for reported atomic coordinate records.
    rcsb_nonpolymer_instance_validation_score.is_best_instanceThis molecular instance is ranked as the best quality instance of this nonpolymer entity.
    rcsb_nonpolymer_instance_validation_score.is_subject_of_investigationThis molecular entity is identified as the subject of the current study.
    rcsb_nonpolymer_instance_validation_score.is_subject_of_investigation_provenanceThe provenance for the selection of the molecular entity identified as the subject of the current study.
    rcsb_nonpolymer_instance_validation_score.mogul_angle_outliersNumber of bond angle outliers obtained from a CCDC Mogul survey of bond angles in the CSD small
    molecule crystal structure database. Outliers are defined as bond angles that have a Z-score
    less than -2 or greater than 2.
    rcsb_nonpolymer_instance_validation_score.mogul_angles_RMSZThe root-mean-square value of the Z-scores of bond angles for the non-polymer instance in degrees
    obtained from a CCDC Mogul survey of bond angles in the CSD small molecule crystal structure database.
    rcsb_nonpolymer_instance_validation_score.mogul_bond_outliersNumber of bond distance outliers obtained from a CCDC Mogul survey of bond lengths in the CSD small
    molecule crystal structure database. Outliers are defined as bond distances that have a Z-score
    less than -2 or greater than 2.
    rcsb_nonpolymer_instance_validation_score.mogul_bonds_RMSZThe root-mean-square value of the Z-scores of bond lengths for the nonpolymer instance in Angstroms
    obtained from a CCDC Mogul survey of bond lengths in the CSD small molecule crystal structure database.
    rcsb_nonpolymer_instance_validation_score.natoms_edsThe number of atoms in the non-polymer instance returned by the EDS software.
    rcsb_nonpolymer_instance_validation_score.num_mogul_angles_RMSZThe number of bond angles compared to "standard geometry" made using the Mogul program.
    rcsb_nonpolymer_instance_validation_score.num_mogul_bonds_RMSZThe number of bond lengths compared to "standard geometry" made using the Mogul program.
    rcsb_nonpolymer_instance_validation_score.ranking_model_fitThe ranking of the model fit score component.
    rcsb_nonpolymer_instance_validation_score.ranking_model_geometryThe ranking of the model geometry score component.
    rcsb_nonpolymer_instance_validation_score.score_model_fitThe value of the model fit score component.
    rcsb_nonpolymer_instance_validation_score.score_model_geometryThe value of the model geometry score component.
    rcsb_nonpolymer_instance_validation_score.stereo_outliersNumber of stereochemical/chirality errors.
    rcsb_nonpolymer_instance_validation_score.typeScore type.
    rcsb_nonpolymer_struct_conn.connect_typeThe connection type.
    rcsb_nonpolymer_struct_conn.descriptionA description of special details of the connection.
    rcsb_nonpolymer_struct_conn.dist_valueDistance value for this contact.
    rcsb_nonpolymer_struct_conn.idThe value of _rcsb_nonpolymer_struct_conn.id is an identifier for connection.

    Note that this item need not be a number; it can be any unique
    identifier.
    rcsb_nonpolymer_struct_conn.ordinal_idThe value of _rcsb_nonpolymer_struct_conn.id must uniquely identify a record in
    the rcsb_nonpolymer_struct_conn list.
    rcsb_nonpolymer_struct_conn.roleThe chemical or structural role of the interaction
    rcsb_nonpolymer_struct_conn.value_orderThe chemical bond order associated with the specified atoms in
    this contact.
    rcsb_nonpolymer_struct_conn.connect_target.auth_asym_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.auth_asym_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.auth_seq_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.auth_seq_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.label_alt_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_alt_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.label_asym_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.label_atom_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_atom_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.label_comp_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.label_seq_idA component of the identifier for the target of the structure
    connection.

    This data item is a pointer to _atom_site.connect_target_label_seq_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_target.symmetryDescribes the symmetry operation that should be applied to the
    atom set specified by _rcsb_nonpolymer_struct_conn.label* to generate the
    target of the structure connection.
    rcsb_nonpolymer_struct_conn.connect_partner.label_alt_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_alt_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_partner.label_asym_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_asym_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_partner.label_atom_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _chem_comp_atom.atom_id in the
    CHEM_COMP_ATOM category.
    rcsb_nonpolymer_struct_conn.connect_partner.label_comp_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_comp_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_partner.label_seq_idA component of the identifier for the partner in the structure
    connection.

    This data item is a pointer to _atom_site.label_seq_id in the
    ATOM_SITE category.
    rcsb_nonpolymer_struct_conn.connect_partner.symmetryDescribes the symmetry operation that should be applied to the
    atom set specified by _rcsb_nonpolymer_struct_conn.connect_partner_label* to generate the
    partner in the structure connection.
    rcsb_target_neighbors.alt_idAlternate conformer identifier for the non-polymer entity instance.
    rcsb_target_neighbors.atom_idThe atom identifier for the non-polymer entity instance.
    rcsb_target_neighbors.comp_idComponent identifier for the non-polymer entity instance.
    rcsb_target_neighbors.distanceDistance value for this target interaction.
    rcsb_target_neighbors.target_asym_idThe entity instance identifier for the target of interaction.
    rcsb_target_neighbors.target_atom_idThe atom identifier for the target of interaction.
    rcsb_target_neighbors.target_auth_seq_idThe author residue index for the target of interaction.
    rcsb_target_neighbors.target_comp_idThe chemical component identifier for the target of interaction.
    rcsb_target_neighbors.target_entity_idThe entity identifier for the target of interaction.
    rcsb_target_neighbors.target_is_boundA flag to indicate the nature of the target interaction is covalent or metal-coordination.
    rcsb_target_neighbors.target_model_idModel identifier for the target of interaction.
    rcsb_target_neighbors.target_seq_idThe sequence position for the target of interaction.
    struct_asym.pdbx_PDB_idThis data item is a pointer to _atom_site.pdbx_PDB_strand_id the
    ATOM_SITE category.
    struct_asym.pdbx_alt_idThis data item is a pointer to _atom_site.ndb_alias_strand_id the
    ATOM_SITE category.
    struct_asym.pdbx_orderThis data item gives the order of the structural elements in the
    ATOM_SITE category.
    struct_asym.pdbx_typeThis data item describes the general type of the structural elements
    in the ATOM_SITE category.
    rcsb_idA unique identifier for each object in this entity instance container formed by
    an 'dot' (.) separated concatenation of entry and entity instance identifiers.
    rcsb_latest_revision.major_revisionThe major version number of the latest revision.
    rcsb_latest_revision.minor_revisionThe minor version number of the latest revision.
    rcsb_latest_revision.revision_dateThe release date of the latest revision item.

    Chemical Component Attributes

    Attribute Description
    chem_comp.formulaThe formula for the chemical component. Formulae are written
    according to the following rules:

    (1) Only recognized element symbols may be used.

    (2) Each element symbol is followed by a 'count' number. A count
    of '1' may be omitted.

    (3) A space or parenthesis must separate each cluster of
    (element symbol + count), but in general parentheses are
    not used.

    (4) The order of elements depends on whether carbon is
    present or not. If carbon is present, the order should be:
    C, then H, then the other elements in alphabetical order
    of their symbol. If carbon is not present, the elements
    are listed purely in alphabetic order of their symbol. This
    is the 'Hill' system used by Chemical Abstracts.
    chem_comp.formula_weightFormula mass of the chemical component.
    chem_comp.idThe value of _chem_comp.id must uniquely identify each item in
    the CHEM_COMP list.

    For protein polymer entities, this is the three-letter code for
    the amino acid.

    For nucleic acid polymer entities, this is the one-letter code
    for the base.
    chem_comp.mon_nstd_parent_comp_idThe identifier for the parent component of the nonstandard
    component. May be be a comma separated list if this component
    is derived from multiple components.

    Items in this indirectly point to _chem_comp.id in
    the CHEM_COMP category.
    chem_comp.nameThe full name of the component.
    chem_comp.one_letter_codeFor standard polymer components, the one-letter code for
    the component. For non-standard polymer components, the
    one-letter code for parent component if this exists;
    otherwise, the one-letter code should be given as 'X'.

    Components that derived from multiple parents components
    are described by a sequence of one-letter-codes.
    chem_comp.pdbx_ambiguous_flagA preliminary classification used by PDB to indicate
    that the chemistry of this component while described
    as clearly as possible is still ambiguous. Software
    tools may not be able to process this component
    definition.
    chem_comp.pdbx_formal_chargeThe net integer charge assigned to this component. This is the
    formal charge assignment normally found in chemical diagrams.
    chem_comp.pdbx_initial_dateDate component was added to database.
    chem_comp.pdbx_modified_dateDate component was last modified.
    chem_comp.pdbx_processing_siteThis data item identifies the deposition site that processed
    this chemical component defintion.
    chem_comp.pdbx_release_statusThis data item holds the current release status for the component.
    chem_comp.pdbx_replaced_byIdentifies the _chem_comp.id of the component that
    has replaced this component.
    chem_comp.pdbx_replacesIdentifies the _chem_comp.id's of the components
    which have been replaced by this component.
    Multiple id codes should be separated by commas.
    chem_comp.pdbx_subcomponent_listThe list of subcomponents contained in this component.
    chem_comp.three_letter_codeFor standard polymer components, the common three-letter code for
    the component. Non-standard polymer components and non-polymer
    components are also assigned three-letter-codes.

    For ambiguous polymer components three-letter code should
    be given as 'UNK'. Ambiguous ions are assigned the code 'UNX'.
    Ambiguous non-polymer components are assigned the code 'UNL'.
    chem_comp.typeFor standard polymer components, the type of the monomer.
    Note that monomers that will form polymers are of three types:
    linking monomers, monomers with some type of N-terminal (or 5')
    cap and monomers with some type of C-terminal (or 3') cap.
    pdbx_chem_comp_audit.action_typeThe action associated with this audit record.
    pdbx_chem_comp_audit.comp_idThis data item is a pointer to _chem_comp.id in the CHEM_COMP
    category.
    pdbx_chem_comp_audit.dateThe date associated with this audit record.
    pdbx_chem_comp_audit.detailsAdditional details decribing this change.
    pdbx_chem_comp_audit.ordinalThis data item is an ordinal index for the
    PDBX_CHEM_COMP_AUDIT category.
    pdbx_chem_comp_descriptor.comp_idThis data item is a pointer to _chem_comp.id in the CHEM_COMP
    category.
    pdbx_chem_comp_descriptor.descriptorThis data item contains the descriptor value for this
    component.
    pdbx_chem_comp_descriptor.programThis data item contains the name of the program
    or library used to compute the descriptor.
    pdbx_chem_comp_descriptor.program_versionThis data item contains the version of the program
    or library used to compute the descriptor.
    pdbx_chem_comp_descriptor.typeThis data item contains the descriptor type.
    pdbx_chem_comp_feature.comp_idThe component identifier for this feature.
    pdbx_chem_comp_feature.sourceThe information source for the component feature.
    pdbx_chem_comp_feature.typeThe component feature type.
    pdbx_chem_comp_feature.valueThe component feature value.
    pdbx_chem_comp_identifier.comp_idThis data item is a pointer to _chem_comp.id in the CHEM_COMP
    category.
    pdbx_chem_comp_identifier.identifierThis data item contains the identifier value for this
    component.
    pdbx_chem_comp_identifier.programThis data item contains the name of the program
    or library used to compute the identifier.
    pdbx_chem_comp_identifier.program_versionThis data item contains the version of the program
    or library used to compute the identifier.
    pdbx_chem_comp_identifier.typeThis data item contains the identifier type.
    pdbx_family_prd_audit.action_typeThe action associated with this audit record.
    pdbx_family_prd_audit.annotatorThe initials of the annotator creating of modifying the family.
    pdbx_family_prd_audit.dateThe date associated with this audit record.
    pdbx_family_prd_audit.detailsAdditional details decribing this change.
    pdbx_family_prd_audit.family_prd_idThis data item is a pointer to _pdbx_reference_molecule_family.family_prd_id in the
    pdbx_reference_molecule category.
    pdbx_family_prd_audit.processing_siteAn identifier for the wwPDB site creating or modifying the family.
    pdbx_prd_audit.action_typeThe action associated with this audit record.
    pdbx_prd_audit.annotatorThe initials of the annotator creating of modifying the molecule.
    pdbx_prd_audit.dateThe date associated with this audit record.
    pdbx_prd_audit.detailsAdditional details decribing this change.
    pdbx_prd_audit.prd_idThis data item is a pointer to _pdbx_reference_molecule.prd_id in the
    pdbx_reference_molecule category.
    pdbx_prd_audit.processing_siteAn identifier for the wwPDB site creating or modifying the molecule.
    pdbx_reference_entity_list.component_idThe component number of this entity within the molecule.
    pdbx_reference_entity_list.detailsAdditional details about this entity.
    pdbx_reference_entity_list.prd_idThe value of _pdbx_reference_entity_list.prd_id is a reference
    _pdbx_reference_molecule.prd_id in the PDBX_REFERENCE_MOLECULE category.
    pdbx_reference_entity_list.ref_entity_idThe value of _pdbx_reference_entity_list.ref_entity_id is a unique identifier
    the a constituent entity within this reference molecule.
    pdbx_reference_entity_list.typeDefines the polymer characteristic of the entity.
    pdbx_reference_entity_poly.db_codeThe database code for this source information
    pdbx_reference_entity_poly.db_nameThe database name for this source information
    pdbx_reference_entity_poly.prd_idThe value of _pdbx_reference_entity_poly.prd_id is a reference
    _pdbx_reference_entity_list.prd_id in the PDBX_REFERENCE_ENTITY_LIST category.
    pdbx_reference_entity_poly.ref_entity_idThe value of _pdbx_reference_entity_poly.ref_entity_id is a reference
    to _pdbx_reference_entity_list.ref_entity_id in PDBX_REFERENCE_ENTITY_LIST category.
    pdbx_reference_entity_poly.typeThe type of the polymer.
    pdbx_reference_entity_poly_link.atom_id_1The atom identifier/name in the first of the two components making
    the linkage.
    pdbx_reference_entity_poly_link.atom_id_2The atom identifier/name in the second of the two components making
    the linkage.
    pdbx_reference_entity_poly_link.comp_id_1The component identifier in the first of the two components making the
    linkage.

    This data item is a pointer to _pdbx_reference_entity_poly_seq.mon_id
    in the PDBX_REFERENCE_ENTITY_POLY_SEQ category.
    pdbx_reference_entity_poly_link.comp_id_2The component identifier in the second of the two components making the
    linkage.

    This data item is a pointer to _pdbx_reference_entity_poly_seq.mon_id
    in the PDBX_REFERENCE_ENTITY_POLY_SEQ category.
    pdbx_reference_entity_poly_link.component_idThe entity component identifier entity containing the linkage.
    pdbx_reference_entity_poly_link.entity_seq_num_1For a polymer entity, the sequence number in the first of
    the two components making the linkage.

    This data item is a pointer to _pdbx_reference_entity_poly_seq.num
    in the PDBX_REFERENCE_ENTITY_POLY_SEQ category.
    pdbx_reference_entity_poly_link.entity_seq_num_2For a polymer entity, the sequence number in the second of
    the two components making the linkage.

    This data item is a pointer to _pdbx_reference_entity_poly_seq.num
    in the PDBX_REFERENCE_ENTITY_POLY_SEQ category.
    pdbx_reference_entity_poly_link.link_idThe value of _pdbx_reference_entity_poly_link.link_id uniquely identifies
    a linkage within a polymer entity.
    pdbx_reference_entity_poly_link.prd_idThe value of _pdbx_reference_entity_poly_link.prd_id is a reference
    _pdbx_reference_entity_list.prd_id in the PDBX_REFERENCE_ENTITY_POLY category.
    pdbx_reference_entity_poly_link.ref_entity_idThe reference entity id of the polymer entity containing the linkage.

    This data item is a pointer to _pdbx_reference_entity_poly.ref_entity_id
    in the PDBX_REFERENCE_ENTITY_POLY category.
    pdbx_reference_entity_poly_link.value_orderThe bond order target for the non-standard linkage.
    pdbx_reference_entity_poly_seq.heteroA flag to indicate that sequence heterogeneity at this monomer position.
    pdbx_reference_entity_poly_seq.mon_idThis data item is the chemical component identifier of monomer.
    pdbx_reference_entity_poly_seq.numThe value of _pdbx_reference_entity_poly_seq.num must uniquely and sequentially
    identify a record in the PDBX_REFERENCE_ENTITY_POLY_SEQ list.

    This value is conforms to author numbering conventions and does not map directly
    to the numbering conventions used for _entity_poly_seq.num.
    pdbx_reference_entity_poly_seq.observedA flag to indicate that this monomer is observed in the instance example.
    pdbx_reference_entity_poly_seq.parent_mon_idThis data item is the chemical component identifier for the parent component corresponding to this monomer.
    pdbx_reference_entity_poly_seq.prd_idThe value of _pdbx_reference_entity_poly_seq.prd_id is a reference
    _pdbx_reference_entity_poly.prd_id in the PDBX_REFERENCE_ENTITY_POLY category.
    pdbx_reference_entity_poly_seq.ref_entity_idThe value of _pdbx_reference_entity_poly_seq.ref_entity_id is a reference
    to _pdbx_reference_entity_poly.ref_entity_id in PDBX_REFERENCE_ENTITY_POLY category.
    pdbx_reference_entity_sequence.NRP_flagA flag to indicate a non-ribosomal entity.
    pdbx_reference_entity_sequence.one_letter_codesThe one-letter-code sequence for this entity. Non-standard monomers are represented as 'X'.
    pdbx_reference_entity_sequence.prd_idThe value of _pdbx_reference_entity_sequence.prd_id is a reference
    _pdbx_reference_entity_list.prd_id in the PDBX_REFERENCE_ENTITY_LIST category.
    pdbx_reference_entity_sequence.ref_entity_idThe value of _pdbx_reference_entity_sequence.ref_entity_id is a reference
    to _pdbx_reference_entity_list.ref_entity_id in PDBX_REFERENCE_ENTITY_LIST category.
    pdbx_reference_entity_sequence.typeThe monomer type for the sequence.
    pdbx_reference_entity_src_nat.atccThe Americal Tissue Culture Collection code for organism from which the entity was isolated.
    pdbx_reference_entity_src_nat.db_codeThe database code for this source information
    pdbx_reference_entity_src_nat.db_nameThe database name for this source information
    pdbx_reference_entity_src_nat.ordinalThe value of _pdbx_reference_entity_src_nat.ordinal distinguishes
    source details for this entity.
    pdbx_reference_entity_src_nat.organism_scientificThe scientific name of the organism from which the entity was isolated.
    pdbx_reference_entity_src_nat.prd_idThe value of _pdbx_reference_entity_src_nat.prd_id is a reference
    _pdbx_reference_entity_list.prd_id in the PDBX_REFERENCE_ENTITY_LIST category.
    pdbx_reference_entity_src_nat.ref_entity_idThe value of _pdbx_reference_entity_src_nat.ref_entity_id is a reference
    to _pdbx_reference_entity_list.ref_entity_id in PDBX_REFERENCE_ENTITY_LIST category.
    pdbx_reference_entity_src_nat.sourceThe data source for this information.
    pdbx_reference_entity_src_nat.source_idA identifier within the data source for this information.
    pdbx_reference_entity_src_nat.taxidThe NCBI TaxId of the organism from which the entity was isolated.
    pdbx_reference_molecule.chem_comp_idFor entities represented as single molecules, the identifier
    corresponding to the chemical definition for the molecule.
    pdbx_reference_molecule.classBroadly defines the function of the entity.
    pdbx_reference_molecule.class_evidence_codeEvidence for the assignment of _pdbx_reference_molecule.class
    pdbx_reference_molecule.compound_detailsSpecial details about this molecule.
    pdbx_reference_molecule.descriptionDescription of this molecule.
    pdbx_reference_molecule.formulaThe formula for the reference entity. Formulae are written
    according to the rules:

    1. Only recognised element symbols may be used.

    2. Each element symbol is followed by a 'count' number. A count
    of '1' may be omitted.

    3. A space or parenthesis must separate each element symbol and
    its count, but in general parentheses are not used.

    4. The order of elements depends on whether or not carbon is
    present. If carbon is present, the order should be: C, then
    H, then the other elements in alphabetical order of their
    symbol. If carbon is not present, the elements are listed
    purely in alphabetic order of their symbol. This is the
    'Hill' system used by Chemical Abstracts.
    pdbx_reference_molecule.formula_weightFormula mass in daltons of the entity.
    pdbx_reference_molecule.nameA name of the entity.
    pdbx_reference_molecule.prd_idThe value of _pdbx_reference_molecule.prd_id is the unique identifier
    for the reference molecule in this family.

    By convention this ID uniquely identifies the reference molecule in
    in the PDB reference dictionary.

    The ID has the template form PRD_dddddd (e.g. PRD_000001)
    pdbx_reference_molecule.release_statusDefines the current PDB release status for this molecule definition.
    pdbx_reference_molecule.replaced_byAssigns the identifier of the reference molecule that has replaced this molecule.
    pdbx_reference_molecule.replacesAssigns the identifier for the reference molecule which have been replaced
    by this reference molecule.
    Multiple molecule identifier codes should be separated by commas.
    pdbx_reference_molecule.represent_asDefines how this entity is represented in PDB data files.
    pdbx_reference_molecule.representative_PDB_id_codeThe PDB accession code for the entry containing a representative example of this molecule.
    pdbx_reference_molecule.typeDefines the structural classification of the entity.
    pdbx_reference_molecule.type_evidence_codeEvidence for the assignment of _pdbx_reference_molecule.type
    pdbx_reference_molecule_annotation.family_prd_idThe value of _pdbx_reference_molecule_annotation.family_prd_id is a reference to
    _pdbx_reference_molecule_list.family_prd_id in category PDBX_REFERENCE_MOLECULE_FAMILY_LIST.
    pdbx_reference_molecule_annotation.ordinalThis data item distinguishes anotations for this entity.
    pdbx_reference_molecule_annotation.prd_idThis data item is a pointer to _pdbx_reference_molecule.prd_id in the
    PDB_REFERENCE_MOLECULE category.
    pdbx_reference_molecule_annotation.sourceThe source of the annoation for this entity.
    pdbx_reference_molecule_annotation.textText describing the annotation for this entity.
    pdbx_reference_molecule_annotation.typeType of annotation for this entity.
    pdbx_reference_molecule_details.family_prd_idThe value of _pdbx_reference_molecule_details.family_prd_id is a reference to
    _pdbx_reference_molecule_list.family_prd_id' in category PDBX_REFERENCE_MOLECULE_FAMILY.
    pdbx_reference_molecule_details.ordinalThe value of _pdbx_reference_molecule_details.ordinal is an ordinal that
    distinguishes each descriptive text for this entity.
    pdbx_reference_molecule_details.sourceA data source of this information (e.g. PubMed, Merck Index)
    pdbx_reference_molecule_details.source_idA identifier within the data source for this information.
    pdbx_reference_molecule_details.textThe text of the description of special aspects of the entity.
    pdbx_reference_molecule_family.family_prd_idThe value of _pdbx_reference_entity.family_prd_id must uniquely identify a record in the
    PDBX_REFERENCE_MOLECULE_FAMILY list.

    By convention this ID uniquely identifies the reference family in
    in the PDB reference dictionary.

    The ID has the template form FAM_dddddd (e.g. FAM_000001)
    pdbx_reference_molecule_family.nameThe entity family name.
    pdbx_reference_molecule_family.release_statusAssigns the current PDB release status for this family.
    pdbx_reference_molecule_family.replaced_byAssigns the identifier of the family that has replaced this component.
    pdbx_reference_molecule_family.replacesAssigns the identifier for the family which have been replaced by this family.
    Multiple family identifier codes should be separated by commas.
    pdbx_reference_molecule_features.family_prd_idThe value of _pdbx_reference_molecule_features.family_prd_id is a reference to
    _pdbx_reference_molecule_list.family_prd_id in category PDBX_REFERENCE_MOLECULE_FAMILY_LIST.
    pdbx_reference_molecule_features.ordinalThe value of _pdbx_reference_molecule_features.ordinal distinguishes
    each feature for this entity.
    pdbx_reference_molecule_features.prd_idThe value of _pdbx_reference_molecule_features.prd_id is a reference
    _pdbx_reference_molecule.prd_id in the PDBX_REFERENCE_MOLECULE category.
    pdbx_reference_molecule_features.sourceThe information source for the component feature.
    pdbx_reference_molecule_features.source_ordinalThe value of _pdbx_reference_molecule_features.source_ordinal provides
    the priority order of features from a particular source or database.
    pdbx_reference_molecule_features.typeThe entity feature type.
    pdbx_reference_molecule_features.valueThe entity feature value.
    pdbx_reference_molecule_list.family_prd_idThe value of _pdbx_reference_molecule_list.family_prd_id is a reference to
    _pdbx_reference_molecule_family.family_prd_id' in category PDBX_REFERENCE_MOLECULE_FAMILY.
    pdbx_reference_molecule_list.prd_idThe value of _pdbx_reference_molecule_list.prd_id is the unique identifier
    for the reference molecule in this family.

    By convention this ID uniquely identifies the reference molecule in
    in the PDB reference dictionary.

    The ID has the template form PRD_dddddd (e.g. PRD_000001)
    pdbx_reference_molecule_related_structures.citation_idA link to related reference information in the citation category.
    pdbx_reference_molecule_related_structures.db_accessionThe database accession code for the related structure reference.
    pdbx_reference_molecule_related_structures.db_codeThe database identifier code for the related structure reference.
    pdbx_reference_molecule_related_structures.db_nameThe database name for the related structure reference.
    pdbx_reference_molecule_related_structures.family_prd_idThe value of _pdbx_reference_molecule_related_structures.family_prd_id is a reference to
    _pdbx_reference_molecule_list.family_prd_id in category PDBX_REFERENCE_MOLECULE_FAMILY_LIST.
    pdbx_reference_molecule_related_structures.formulaThe formula for the reference entity. Formulae are written
    according to the rules:

    1. Only recognised element symbols may be used.

    2. Each element symbol is followed by a 'count' number. A count
    of '1' may be omitted.

    3. A space or parenthesis must separate each element symbol and
    its count, but in general parentheses are not used.

    4. The order of elements depends on whether or not carbon is
    present. If carbon is present, the order should be: C, then
    H, then the other elements in alphabetical order of their
    symbol. If carbon is not present, the elements are listed
    purely in alphabetic order of their symbol. This is the
    'Hill' system used by Chemical Abstracts.
    pdbx_reference_molecule_related_structures.nameThe chemical name for the structure entry in the related database
    pdbx_reference_molecule_related_structures.ordinalThe value of _pdbx_reference_molecule_related_structures.ordinal distinguishes
    related structural data for each entity.
    pdbx_reference_molecule_synonyms.family_prd_idThe value of _pdbx_reference_molecule_synonyms.family_prd_id is a reference to
    _pdbx_reference_molecule_list.family_prd_id in category PDBX_REFERENCE_MOLECULE_FAMILY_LIST.
    pdbx_reference_molecule_synonyms.nameA synonym name for the entity.
    pdbx_reference_molecule_synonyms.ordinalThe value of _pdbx_reference_molecule_synonyms.ordinal is an ordinal
    to distinguish synonyms for this entity.
    pdbx_reference_molecule_synonyms.prd_idThe value of _pdbx_reference_molecule_synonyms.prd_id is a reference
    _pdbx_reference_molecule.prd_id in the PDBX_REFERENCE_MOLECULE category.
    pdbx_reference_molecule_synonyms.sourceThe source of this synonym name for the entity.
    rcsb_bird_citation.idThe value of _rcsb_bird_citation.id must uniquely identify a record in the
    rcsb_bird_citation list.
    rcsb_bird_citation.journal_abbrevAbbreviated name of the cited journal as given in the
    Chemical Abstracts Service Source Index.
    rcsb_bird_citation.journal_volumeVolume number of the journal cited; relevant for journal
    articles.
    rcsb_bird_citation.page_firstThe first page of the rcsb_bird_citation; relevant for journal
    articles, books and book chapters.
    rcsb_bird_citation.page_lastThe last page of the rcsb_bird_citation; relevant for journal
    articles, books and book chapters.
    rcsb_bird_citation.pdbx_database_id_DOIDocument Object Identifier used by doi.org to uniquely
    specify bibliographic entry.
    rcsb_bird_citation.pdbx_database_id_PubMedAscession number used by PubMed to categorize a specific
    bibliographic entry.
    rcsb_bird_citation.rcsb_authorsNames of the authors of the citation; relevant for journal
    articles, books and book chapters. Names are separated by vertical bars.

    The family name(s), followed by a comma and including any
    dynastic components, precedes the first name(s) or initial(s).
    rcsb_bird_citation.titleThe title of the rcsb_bird_citation; relevant for journal articles, books
    and book chapters.
    rcsb_bird_citation.yearThe year of the rcsb_bird_citation; relevant for journal articles, books
    and book chapters.
    rcsb_chem_comp_annotation.annotation_idAn identifier for the annotation.
    rcsb_chem_comp_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_chem_comp_annotation.descriptionA description for the annotation.
    rcsb_chem_comp_annotation.nameA name for the annotation.
    rcsb_chem_comp_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_chem_comp_annotation.typeA type or category of the annotation.
    rcsb_chem_comp_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_chem_comp_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_chem_comp_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_chem_comp_container_identifiers.atc_codesThe Anatomical Therapeutic Chemical (ATC) Classification System identifiers corresponding
    to the chemical component.
    rcsb_chem_comp_container_identifiers.comp_idThe chemical component identifier.
    rcsb_chem_comp_container_identifiers.drugbank_idThe DrugBank identifier corresponding to the chemical component.
    rcsb_chem_comp_container_identifiers.prd_idThe BIRD definition identifier.
    rcsb_chem_comp_container_identifiers.rcsb_idA unique identifier for the chemical definition in this container.
    rcsb_chem_comp_container_identifiers.subcomponent_idsThe list of subcomponents contained in this component.
    rcsb_chem_comp_descriptor.InChIStandard IUPAC International Chemical Identifier (InChI) descriptor for the chemical component.

    InChI, the IUPAC International Chemical Identifier,
    by Stephen R Heller, Alan McNaught, Igor Pletnev, Stephen Stein and Dmitrii Tchekhovskoi,
    Journal of Cheminformatics, 2015, 7:23;
    rcsb_chem_comp_descriptor.InChIKeyStandard IUPAC International Chemical Identifier (InChI) descriptor key
    for the chemical component

    InChI, the IUPAC International Chemical Identifier,
    by Stephen R Heller, Alan McNaught, Igor Pletnev, Stephen Stein and Dmitrii Tchekhovskoi,
    Journal of Cheminformatics, 2015, 7:23
    rcsb_chem_comp_descriptor.SMILESSimplified molecular-input line-entry system (SMILES) descriptor for the chemical component.

    Weininger D (February 1988). "SMILES, a chemical language and information system. 1.
    Introduction to methodology and encoding rules". Journal of Chemical Information and Modeling. 28 (1): 31-6.

    Weininger D, Weininger A, Weininger JL (May 1989).
    "SMILES. 2. Algorithm for generation of unique SMILES notation",
    Journal of Chemical Information and Modeling. 29 (2): 97-101.
    rcsb_chem_comp_descriptor.SMILES_stereoSimplified molecular-input line-entry system (SMILES) descriptor for the chemical
    component including stereochemical features.

    Weininger D (February 1988). "SMILES, a chemical language and information system. 1.
    Introduction to methodology and encoding rules".
    Journal of Chemical Information and Modeling. 28 (1): 31-6.

    Weininger D, Weininger A, Weininger JL (May 1989).
    "SMILES. 2. Algorithm for generation of unique SMILES notation".
    Journal of Chemical Information and Modeling. 29 (2): 97-101.
    rcsb_chem_comp_descriptor.comp_idThe chemical component identifier.
    rcsb_chem_comp_info.atom_countChemical component total atom count
    rcsb_chem_comp_info.atom_count_chiralChemical component chiral atom count
    rcsb_chem_comp_info.atom_count_heavyChemical component heavy atom count
    rcsb_chem_comp_info.bond_countChemical component total bond count
    rcsb_chem_comp_info.bond_count_aromaticChemical component aromatic bond count
    rcsb_chem_comp_info.comp_idThe chemical component identifier.
    rcsb_chem_comp_info.initial_deposition_dateThe date the chemical definition was first deposited in the PDB repository.
    rcsb_chem_comp_info.initial_release_dateThe initial date the chemical definition was released in the PDB repository.
    rcsb_chem_comp_info.release_statusThe release status of the chemical definition.
    rcsb_chem_comp_info.revision_dateThe date of last revision of the chemical definition.
    rcsb_chem_comp_related.comp_idThe value of _rcsb_chem_comp_related.comp_id is a reference to
    a chemical component definition.
    rcsb_chem_comp_related.ordinalThe value of _rcsb_chem_comp_related.ordinal distinguishes
    related examples for each chemical component.
    rcsb_chem_comp_related.related_mapping_methodThe method used to establish the resource correspondence.
    rcsb_chem_comp_related.resource_accession_codeThe resource identifier code for the related chemical reference.
    rcsb_chem_comp_related.resource_nameThe resource name for the related chemical reference.
    rcsb_chem_comp_synonyms.comp_idThe chemical component to which this synonym applies.
    rcsb_chem_comp_synonyms.nameThe synonym of this particular chemical component.
    rcsb_chem_comp_synonyms.ordinalThis data item is an ordinal index for the
    RCSB_CHEM_COMP_SYNONYMS category.
    rcsb_chem_comp_synonyms.provenance_sourceThe provenance of this synonym.
    rcsb_chem_comp_synonyms.typeThis data item contains the synonym type.
    rcsb_chem_comp_target.comp_idThe value of _rcsb_chem_comp_target.comp_id is a reference to
    a chemical component definition.
    rcsb_chem_comp_target.interaction_typeThe type of target interaction.
    rcsb_chem_comp_target.nameThe chemical component target name.
    rcsb_chem_comp_target.ordinalThe value of _rcsb_chem_comp_target.ordinal distinguishes
    related examples for each chemical component.
    rcsb_chem_comp_target.provenance_sourceA code indicating the provenance of the target interaction assignment
    rcsb_chem_comp_target.reference_database_accession_codeThe reference identifier code for the target interaction reference.
    rcsb_chem_comp_target.reference_database_nameThe reference database name for the target interaction.
    rcsb_chem_comp_target.target_actionsThe mechanism of action of the chemical component - target interaction.
    rcsb_schema_container_identifiers.collection_nameCollection name associated with the data in the container.
    rcsb_schema_container_identifiers.collection_schema_versionVersion string for the schema and collection.
    rcsb_schema_container_identifiers.schema_nameSchema name associated with the data in the container.
    rcsb_idA unique identifier for the chemical definition in this container.

    UniProt Attributes

    Attribute Description
    rcsb_idPrimary accession number of a given UniProtKB entry.
    rcsb_uniprot_container_identifiers.uniprot_idPrimary accession number of a given UniProtKB entry.
    rcsb_uniprot_container_identifiers.reference_sequence_identifiers.database_accessionReference database accession code
    rcsb_uniprot_container_identifiers.reference_sequence_identifiers.database_isoformReference database identifier for the sequence isoform
    rcsb_uniprot_container_identifiers.reference_sequence_identifiers.database_nameReference database name
    rcsb_uniprot_container_identifiers.reference_sequence_identifiers.provenance_sourceSource of the reference database assignment
    rcsb_uniprot_accession
    rcsb_uniprot_entry_name
    rcsb_uniprot_keyword.idA unique keyword identifier.
    rcsb_uniprot_keyword.valueHuman-readable keyword term.
    rcsb_uniprot_protein.sequenceProtein sequence data for canonical protein sequence.
    rcsb_uniprot_protein.name.valueName that allows to unambiguously identify a protein.
    rcsb_uniprot_protein.name.provenance_codeHistorical record of the data attribute.
    rcsb_uniprot_protein.function.detailsGeneral function(s) of a protein.
    rcsb_uniprot_protein.function.provenance_codeHistorical record of the data attribute.
    rcsb_uniprot_protein.gene.name.type
    rcsb_uniprot_protein.gene.name.value
    rcsb_uniprot_protein.source_organism.scientific_nameThe scientific name of the organism in which a protein occurs.
    rcsb_uniprot_protein.source_organism.taxonomy_idNCBI Taxonomy identifier for the organism in which a protein occurs.
    rcsb_uniprot_protein.source_organism.provenance_codeHistorical record of the data attribute.
    rcsb_uniprot_protein.ec.number
    rcsb_uniprot_protein.ec.provenance_codeHistorical record of the data attribute.
    rcsb_uniprot_feature.assignment_versionIdentifies the version of the feature assignment.
    rcsb_uniprot_feature.descriptionA description for the feature.
    rcsb_uniprot_feature.feature_idAn identifier for the feature.
    rcsb_uniprot_feature.nameA name for the feature.
    rcsb_uniprot_feature.provenance_sourceCode identifying the individual, organization or program that
    assigned the feature.
    rcsb_uniprot_feature.reference_schemeCode residue coordinate system for the assigned feature.
    rcsb_uniprot_feature.typeA type or category of the feature.
    rcsb_uniprot_feature.feature_positions.beg_comp_idAn identifier for the monomer(s) corresponding to the feature assignment.
    rcsb_uniprot_feature.feature_positions.beg_seq_idAn identifier for the monomer at which this segment of the feature begins.
    rcsb_uniprot_feature.feature_positions.end_seq_idAn identifier for the monomer at which this segment of the feature ends.
    rcsb_uniprot_feature.feature_positions.valueThe value for the feature over this monomer segment.
    rcsb_uniprot_feature.feature_positions.valuesThe value(s) for the feature over this monomer segment.
    rcsb_uniprot_annotation.annotation_idAn identifier for the annotation.
    rcsb_uniprot_annotation.assignment_versionIdentifies the version of the annotation assignment.
    rcsb_uniprot_annotation.descriptionA description for the annotation.
    rcsb_uniprot_annotation.nameA name for the annotation.
    rcsb_uniprot_annotation.provenance_sourceCode identifying the individual, organization or program that
    assigned the annotation.
    rcsb_uniprot_annotation.typeA type or category of the annotation.
    rcsb_uniprot_annotation.annotation_lineage.depthMembers of the annotation lineage as parent lineage depth (1-N)
    rcsb_uniprot_annotation.annotation_lineage.idMembers of the annotation lineage as parent class identifiers.
    rcsb_uniprot_annotation.annotation_lineage.nameMembers of the annotation lineage as parent class names.
    rcsb_uniprot_annotation.additional_properties.nameThe additional property name
    rcsb_uniprot_annotation.additional_properties.values
    rcsb_uniprot_annotation.additional_properties.values
    rcsb_uniprot_annotation.additional_properties.values
    rcsb_uniprot_external_reference.reference_id
    rcsb_uniprot_external_reference.reference_name
    rcsb_uniprot_external_reference.provenance_source
    rcsb_uniprot_alignments.core_entity_alignments.scores.target_coverage
    rcsb_uniprot_alignments.core_entity_alignments.scores.query_coverage
    rcsb_uniprot_alignments.core_entity_alignments.scores.target_length
    rcsb_uniprot_alignments.core_entity_alignments.scores.query_length
    rcsb_uniprot_alignments.core_entity_alignments.aligned_regions.target_beginNCBI sequence start position
    rcsb_uniprot_alignments.core_entity_alignments.aligned_regions.query_beginEntity seqeunce start position
    rcsb_uniprot_alignments.core_entity_alignments.aligned_regions.lengthAligned region length
    rcsb_uniprot_alignments.core_entity_alignments.core_entity_identifiers.entry_id
    rcsb_uniprot_alignments.core_entity_alignments.core_entity_identifiers.entity_id

    PubMed Attributes

    Attribute Description
    rcsb_idUnique integer value assigned to each PubMed record.
    rcsb_pubmed_container_identifiers.pubmed_idUID assigned to each PubMed record.
    rcsb_pubmed_central_idUnique integer value assigned to each PubMed Central record.
    rcsb_pubmed_doiPersistent identifier used to provide a link to an article location on the Internet.
    rcsb_pubmed_abstract_textA concise, accurate and factual mini-version of the paper contents.
    rcsb_pubmed_affiliation_info
    rcsb_pubmed_mesh_descriptors
    rcsb_pubmed_mesh_descriptors_lineage.idIdentifier for MeSH classification term.
    rcsb_pubmed_mesh_descriptors_lineage.nameMeSH classification term.
    rcsb_pubmed_mesh_descriptors_lineage.depthHierarchy depth.

    DrugBank Attributes

    Attribute Description
    drugbank_container_identifiers.drugbank_idThe DrugBank accession code
    drugbank_info.affected_organismsThe DrugBank drug affected organisms.
    drugbank_info.atc_codesThe Anatomical Therapeutic Chemical Classification System (ATC) codes.
    drugbank_info.brand_namesDrugBank drug brand names.
    drugbank_info.cas_numberThe DrugBank assigned Chemical Abstracts Service identifier.
    drugbank_info.descriptionThe DrugBank drug description.
    drugbank_info.drug_categoriesThe DrugBank drug categories.
    drugbank_info.drug_groupsThe DrugBank drug groups determine their drug development status.
    drugbank_info.drugbank_idThe DrugBank accession code
    drugbank_info.indicationThe DrugBank drug indication.
    drugbank_info.mechanism_of_actionThe DrugBank drug mechanism of actions.
    drugbank_info.nameThe DrugBank drug name.
    drugbank_info.pharmacologyThe DrugBank drug pharmacology.
    drugbank_info.synonymsDrugBank drug name synonyms.
    drugbank_info.drug_products.approvedIndicates whether this drug has been approved by the regulating government.
    drugbank_info.drug_products.countryThe country where this commercially available drug has been approved.
    drugbank_info.drug_products.ended_marketing_onThe ending date for market approval.
    drugbank_info.drug_products.nameThe proprietary name(s) provided by the manufacturer for any commercially available products containing this drug.
    drugbank_info.drug_products.sourceSource of this product information. For example, a value of DPD indicates this information was retrieved from the Canadian Drug Product Database.
    drugbank_info.drug_products.started_marketing_onThe starting date for market approval.
    drugbank_target.interaction_typeThe type of target interaction.
    drugbank_target.nameThe target name.
    drugbank_target.ordinalThe value of _drugbank_target.ordinal distinguishes
    related examples for each chemical component.
    drugbank_target.organism_common_nameThe organism common name.
    drugbank_target.reference_database_accession_codeThe reference identifier code for the target interaction reference.
    drugbank_target.reference_database_nameThe reference database name for the target interaction.
    drugbank_target.seq_one_letter_codeTarget sequence expressed as string of one-letter amino acid codes.
    drugbank_target.target_actionsThe actions of the target interaction.