# /rcsb/entries/search

`POST /api/rcsb/entries/search`

Price: 1 credit

Search PDB structures by text and by method, resolution, organism, ligand and date filters

## How to use it

`query` is free text over the whole record while every other field is an exact filter, and they are combined with AND, so a filter-only request needs no `query`. Resolution filters silently exclude NMR structures, which have no resolution at all. `taxonomy_id` matches anywhere in the lineage, so 40674 returns every mammal while `organism` pins one species name. Rows are full structure records, identical to what the single-entry endpoint returns.

## Parameters

- `access-token` (string, required)

## Request body

- `timeout` (integer) — Max scrapping execution timeout (in seconds) (default: 300; min: 20; max: 1500)
- `query` (string, nullable) — Free text matched across titles, keywords, authors, ligands and annotations (examples: "hemoglobin", "SARS-CoV-2 spike"; minLength: 1)
- `structure_title` (string, nullable) — Words that must appear in the structure title (examples: "kinase"; minLength: 1)
- `keyword_category` (string, nullable) — Words from the deposited keyword category of the structure (examples: "TRANSFERASE"; minLength: 1)
- `author` (string, nullable) — Depositing author, written as the source does: surname, initials (examples: "Perutz, M.F."; minLength: 1)
- `experimental_method` (string, nullable) — Experimental technique the structure was solved by (one of: "X-RAY DIFFRACTION", "ELECTRON MICROSCOPY", "SOLUTION NMR", "ELECTRON CRYSTALLOGRAPHY", "NEUTRON DIFFRACTION", "SOLID-STATE NMR", "SOLUTION SCATTERING", "FIBER DIFFRACTION", "POWDER DIFFRACTION", "EPR", "THEORETICAL MODEL", "INFRARED SPECTROSCOPY", "FLUORESCENCE TRANSFER")
- `polymer_composition` (string, nullable) — Kinds of polymer chain the structure contains (one of: "homomeric protein", "heteromeric protein", "protein/NA", "protein/oligosaccharide", "DNA", "RNA", "protein/NA/oligosaccharide", "NA-hybrid", "DNA/RNA", "other type pair", "oligosaccharide", "NA/oligosaccharide", "other", "other type composition")
- `organism` (string, nullable) — Scientific name of the source organism of a chain (examples: "Homo sapiens"; minLength: 1)
- `taxonomy_id` (string, nullable) — NCBI taxonomy identifier matched anywhere in the source organism lineage, so a clade identifier also matches every species below it (examples: "9606", "40674"; minLength: 1)
- `uniprot_accession` (string, nullable) — Keep structures whose chains map to this UniProt accession (examples: "P69905"; minLength: 1)
- `ligand_id` (string, nullable) — PDB chemical component code that must be bound in the structure (examples: "HEM", "ATP"; minLength: 1)
- `ec_number` (string, nullable) — Enzyme Commission number of a chain (examples: "2.7.11.1"; minLength: 1)
- `min_resolution` (number, nullable) — Lowest resolution number to keep, in angstroms, so the finest structure kept is this value and anything finer than it is dropped (examples: 1.5; min: 0)
- `max_resolution` (number, nullable) — Highest resolution number to keep, in angstroms, so the coarsest structure kept is this value and anything coarser than it is dropped (examples: 2; min: 0)
- `min_molecular_weight` (number, nullable) — Lowest structure molecular weight, in kilodaltons (examples: 50; min: 0)
- `max_molecular_weight` (number, nullable) — Highest structure molecular weight, in kilodaltons (examples: 500; min: 0)
- `min_polymer_entity_count` (integer, nullable) — Fewest distinct polymer chains the structure must have (examples: 2; min: 1)
- `released_after` (string, nullable) — Keep structures first released on or after this date, written as YYYY-MM-DD (examples: "2020-01-01"; minLength: 1)
- `released_before` (string, nullable) — Keep structures first released on or before this date, written as YYYY-MM-DD (examples: "2023-12-31"; minLength: 1)
- `deposited_after` (string, nullable) — Keep structures deposited on or after this date, written as YYYY-MM-DD (examples: "2020-01-01"; minLength: 1)
- `deposited_before` (string, nullable) — Keep structures deposited on or before this date, written as YYYY-MM-DD (examples: "2023-12-31"; minLength: 1)
- `sort` (string, nullable) — Result ordering (one of: "score", "-rcsb_accession_info.initial_release_date", "rcsb_accession_info.initial_release_date", "-rcsb_accession_info.deposit_date", "rcsb_accession_info.deposit_date", "rcsb_entry_info.resolution_combined", "-rcsb_entry_info.resolution_combined", "-rcsb_entry_info.molecular_weight", "rcsb_entry_info.molecular_weight")
- `count` (integer, required) — Max number of results (min: 1; max: 500)

## Response

### 200 — Successful Response

- `@type` (string) (default: "RcsbEntry")
- `id` (string) (default: "")
- `keywords` (string) (default: "")
- `keyword_category` (string) (default: "")
- `experimental_methods` (array) (default: [])
- `crystal_count` (integer, nullable)
- `resolutions` (array) (default: [])
- `deposit_date` (string) (default: "")
- `release_date` (string) (default: "")
- `revision_date` (string) (default: "")
- `status` (string) (default: "")
- `major_revision` (integer, nullable)
- `minor_revision` (integer, nullable)
- `has_released_experimental_data` (boolean, nullable)
- `received_date` (string) (default: "")
- `deposit_site` (string) (default: "")
- `process_site` (string) (default: "")
- `structure_factor_status` (string) (default: "")
- `is_pdb_format_compatible` (boolean, nullable)
- `is_structural_genomics` (boolean, nullable)
- `is_casp_target` (boolean, nullable)
- `structural_genomics_center` (string) (default: "")
- `structural_genomics_project` (string) (default: "")
- `pubmed_id` (string) (default: "")
- `assembly_ids` (array) (default: [])
- `entity_ids` (array) (default: [])
- `polymer_entity_ids` (array) (default: [])
- `nonpolymer_entity_ids` (array) (default: [])
- `branched_entity_ids` (array) (default: [])
- `model_ids` (array) (default: [])
- `emdb_ids` (array) (default: [])
- `related_emdb_ids` (array) (default: [])
- `authors` (array) (default: [])
  - `@type` (string) (default: "RcsbEntryAuthor")
  - `name` (string) (default: "")
  - `orcid` (string) (default: "")
- `primary_citation` (object, nullable)
  - `@type` (string) (default: "RcsbCitation")
  - `id` (string) (default: "")
  - `journal` (string) (default: "")
  - `journal_abbreviation` (string) (default: "")
  - `authors` (array) (default: [])
  - `author_orcids` (array) (default: [])
  - `year` (integer, nullable)
  - `volume` (string) (default: "")
  - `first_page` (string) (default: "")
  - `last_page` (string) (default: "")
  - `doi` (string) (default: "")
  - `pubmed_id` (string) (default: "")
  - `issn` (string) (default: "")
  - `astm_id` (string) (default: "")
  - `csd_id` (string) (default: "")
  - `country` (string) (default: "")
  - `book_publisher` (string) (default: "")
  - `is_primary` (boolean, nullable)
- `citations` (array) (default: [])
  - `@type` (string) (default: "RcsbCitation")
  - `id` (string) (default: "")
  - `journal` (string) (default: "")
  - `journal_abbreviation` (string) (default: "")
  - `authors` (array) (default: [])
  - `author_orcids` (array) (default: [])
  - `year` (integer, nullable)
  - `volume` (string) (default: "")
  - `first_page` (string) (default: "")
  - `last_page` (string) (default: "")
  - `doi` (string) (default: "")
  - `pubmed_id` (string) (default: "")
  - `issn` (string) (default: "")
  - `astm_id` (string) (default: "")
  - `csd_id` (string) (default: "")
  - `country` (string) (default: "")
  - `book_publisher` (string) (default: "")
  - `is_primary` (boolean, nullable)
- `funding` (array) (default: [])
  - `@type` (string) (default: "RcsbFunding")
  - `organization` (string) (default: "")
  - `country` (string) (default: "")
  - `grant_number` (string) (default: "")
- `database_references` (array) (default: [])
  - `@type` (string) (default: "RcsbDatabaseReference")
  - `database_id` (string) (default: "")
  - `code` (string) (default: "")
  - `accession` (string) (default: "")
  - `doi` (string) (default: "")
- `related_entries` (array) (default: [])
  - `@type` (string) (default: "RcsbRelatedEntry")
  - `database_name` (string) (default: "")
  - `database_entry_id` (string) (default: "")
  - `content_type` (string) (default: "")
  - `details` (string) (default: "")
- `external_references` (array) (default: [])
  - `@type` (string) (default: "RcsbExternalReference")
  - `id` (string) (default: "")
  - `type` (string) (default: "")
  - `url` (string) (default: "")
- `revision_history` (array) (default: [])
  - `@type` (string) (default: "RcsbRevision")
  - `ordinal` (integer, nullable)
  - `revision_date` (string) (default: "")
  - `major_revision` (integer, nullable)
  - `minor_revision` (integer, nullable)
  - `data_content_type` (string) (default: "")
- `revision_details` (array) (default: [])
  - `@type` (string) (default: "RcsbRevisionDetail")
  - `ordinal` (integer, nullable)
  - `revision_ordinal` (integer, nullable)
  - `provider` (string) (default: "")
  - `type` (string) (default: "")
  - `data_content_type` (string) (default: "")
  - `description` (string) (default: "")
- `software` (array) (default: [])
  - `@type` (string) (default: "RcsbSoftware")
  - `name` (string) (default: "")
  - `version` (string) (default: "")
  - `classification` (string) (default: "")
  - `type` (string) (default: "")
  - `language` (string) (default: "")
  - `url` (string) (default: "")
  - `contact_author` (string) (default: "")
  - `contact_author_email` (string) (default: "")
  - `date` (string) (default: "")
- `supersede_records` (array) (default: [])
  - `@type` (string) (default: "RcsbSupersedeRecord")
  - `entry_id` (string) (default: "")
  - `replaced_entry_id` (string) (default: "")
- `initial_refinement_models` (array) (default: [])
  - `@type` (string) (default: "RcsbInitialRefinementModel")
  - `type` (string) (default: "")
  - `source_name` (string) (default: "")
  - `accession_code` (string) (default: "")
- `info` (object, nullable)
  - `@type` (string) (default: "RcsbEntryInfo")
  - `experimental_method` (string) (default: "")
  - `experimental_method_count` (integer, nullable)
  - `structure_determination_methodology` (string) (default: "")
  - `polymer_composition` (string) (default: "")
  - `selected_polymer_entity_types` (string) (default: "")
  - `na_polymer_entity_types` (string) (default: "")
  - `molecular_weight` (number, nullable)
  - `assembly_count` (integer, nullable)
  - `entity_count` (integer, nullable)
  - `polymer_entity_count` (integer, nullable)
  - `protein_entity_count` (integer, nullable)
  - `dna_entity_count` (integer, nullable)
  - `rna_entity_count` (integer, nullable)
  - `nucleic_acid_entity_count` (integer, nullable)
  - `nucleic_acid_hybrid_entity_count` (integer, nullable)
  - `nonpolymer_entity_count` (integer, nullable)
  - `branched_entity_count` (integer, nullable)
  - `solvent_entity_count` (integer, nullable)
  - `polymer_entity_taxonomy_count` (integer, nullable)
  - `deposited_model_count` (integer, nullable)
  - `deposited_atom_count` (integer, nullable)
  - `deposited_hydrogen_atom_count` (integer, nullable)
  - `deposited_solvent_atom_count` (integer, nullable)
  - `deposited_deuterated_water_count` (integer, nullable)
  - `deposited_polymer_monomer_count` (integer, nullable)
  - `deposited_modeled_polymer_monomer_count` (integer, nullable)
  - `deposited_unmodeled_polymer_monomer_count` (integer, nullable)
  - `deposited_polymer_entity_instance_count` (integer, nullable)
  - `deposited_nonpolymer_entity_instance_count` (integer, nullable)
  - `disulfide_bond_count` (integer, nullable)
  - `cis_peptide_count` (integer, nullable)
  - `inter_molecular_covalent_bond_count` (integer, nullable)
  - `inter_molecular_metallic_bond_count` (integer, nullable)
  - `polymer_molecular_weight_minimum` (number, nullable)
  - `polymer_molecular_weight_maximum` (number, nullable)
  - `polymer_monomer_count_minimum` (integer, nullable)
  - `polymer_monomer_count_maximum` (integer, nullable)
  - `nonpolymer_molecular_weight_minimum` (number, nullable)
  - `nonpolymer_molecular_weight_maximum` (number, nullable)
  - `branched_molecular_weight_minimum` (number, nullable)
  - `branched_molecular_weight_maximum` (number, nullable)
  - `nucleic_acid_features_combined` (array) (default: [])
  - `nonpolymer_bound_components` (array) (default: [])
  - `software_programs_combined` (array) (default: [])
  - `diffraction_resolution_high` (number, nullable)
  - `radiation_wavelength_minimum` (number, nullable)
  - `radiation_wavelength_maximum` (number, nullable)
  - `structure_determination_methodology_priority` (integer, nullable)
- `crystal` (object, nullable)
  - `@type` (string) (default: "RcsbCrystal")
  - `length_a` (number, nullable)
  - `length_b` (number, nullable)
  - `length_c` (number, nullable)
  - `angle_alpha` (number, nullable)
  - `angle_beta` (number, nullable)
  - `angle_gamma` (number, nullable)
  - `volume` (number, nullable)
  - `molecules_per_unit_cell` (integer, nullable)
  - `space_group_name` (string) (default: "")
  - `space_group_number` (integer, nullable)
  - `space_group_hall` (string) (default: "")
  - `cell_setting` (string) (default: "")
  - `density_matthews` (number, nullable)
  - `density_percent_solvent` (number, nullable)
  - `mosaicity` (number, nullable)
  - `growth_method` (string) (default: "")
  - `growth_ph` (number, nullable)
  - `growth_ph_range` (string) (default: "")
  - `growth_temperature` (number, nullable)
  - `growth_temperature_details` (string) (default: "")
  - `growth_details` (string) (default: "")
  - `description` (string) (default: "")
- `refinement` (object, nullable)
  - `@type` (string) (default: "RcsbRefinement")
  - `resolution_high` (number, nullable)
  - `resolution_low` (number, nullable)
  - `r_work` (number, nullable)
  - `r_free` (number, nullable)
  - `r_free_error` (number, nullable)
  - `r_observed` (number, nullable)
  - `b_factor_mean` (number, nullable)
  - `b_factor_min` (number, nullable)
  - `b_factor_max` (number, nullable)
  - `reflection_count_observed` (integer, nullable)
  - `reflection_count_work` (integer, nullable)
  - `reflection_count_free` (integer, nullable)
  - `percent_reflections_observed` (number, nullable)
  - `percent_reflections_free` (number, nullable)
  - `method_to_determine_structure` (string) (default: "")
  - `cross_validation_method` (string) (default: "")
  - `stereochemistry_target_values` (string) (default: "")
  - `solvent_model_details` (string) (default: "")
  - `overall_phase_error` (number, nullable)
  - `overall_su_ml` (number, nullable)
  - `sigma_f_cutoff` (number, nullable)
  - `free_reflection_selection_details` (string) (default: "")
  - `solvent_vdw_probe_radii` (number, nullable)
  - `solvent_shrinkage_radii` (number, nullable)
  - `solvent_model_parameter_ksol` (number, nullable)
  - `solvent_model_parameter_bsol` (number, nullable)
  - `luzzati_coordinate_error` (number, nullable)
  - `luzzati_coordinate_error_free` (number, nullable)
  - `luzzati_sigma_a` (number, nullable)
  - `luzzati_resolution_low` (number, nullable)
  - `atom_count_total` (integer, nullable)
  - `atom_count_protein` (integer, nullable)
  - `atom_count_nucleic_acid` (integer, nullable)
  - `atom_count_ligand` (integer, nullable)
  - `atom_count_solvent` (integer, nullable)
  - `residue_count_total` (integer, nullable)
  - `b_factor_mean_ligand` (number, nullable)
  - `b_factor_mean_solvent` (number, nullable)
  - `isotropic_thermal_model` (string) (default: "")
  - `starting_model` (string) (default: "")
  - `r_all` (number, nullable)
  - `reflection_count_all` (integer, nullable)
  - `parameter_count` (integer, nullable)
  - `restraint_count` (integer, nullable)
  - `correlation_coefficient_fo_to_fc` (number, nullable)
  - `correlation_coefficient_fo_to_fc_free` (number, nullable)
  - `overall_fom_work_r_set` (number, nullable)
  - `overall_su_b` (number, nullable)
  - `overall_esu_r` (number, nullable)
  - `overall_esu_r_free` (number, nullable)
  - `sigma_i_cutoff` (number, nullable)
  - `data_cutoff_high_abs_f` (number, nullable)
  - `data_cutoff_high_rms_abs_f` (number, nullable)
  - `data_cutoff_low_abs_f` (number, nullable)
  - `solvent_ion_probe_radii` (number, nullable)
  - `tls_residual_adp_flag` (string) (default: "")
  - `anisotropic_b_1_1` (number, nullable)
  - `anisotropic_b_1_2` (number, nullable)
  - `anisotropic_b_1_3` (number, nullable)
  - `anisotropic_b_2_2` (number, nullable)
  - `anisotropic_b_2_3` (number, nullable)
  - `anisotropic_b_3_3` (number, nullable)
  - `luzzati_sigma_a_free` (number, nullable)
  - `occupancy_min` (number, nullable)
  - `occupancy_max` (number, nullable)
  - `weighted_r_work` (number, nullable)
  - `weighted_r_free` (number, nullable)
  - `average_fsc_work` (number, nullable)
  - `average_fsc_free` (number, nullable)
  - `overall_su_r_free` (number, nullable)
  - `overall_su_r_cruickshank_dpi` (number, nullable)
  - `overall_su_r_free_cruickshank_dpi` (number, nullable)
  - `overall_su_r_blow_dpi` (number, nullable)
  - `overall_su_r_free_blow_dpi` (number, nullable)
  - `disordered_residue_count` (integer, nullable)
  - `occupancy_sum_hydrogen` (number, nullable)
  - `occupancy_sum_non_hydrogen` (number, nullable)
  - `details` (string) (default: "")
- `diffraction` (object, nullable)
  - `@type` (string) (default: "RcsbDiffraction")
  - `ambient_temperature` (number, nullable)
  - `is_serial_crystallography` (boolean, nullable)
  - `detector` (string) (default: "")
  - `detector_type` (string) (default: "")
  - `detector_details` (string) (default: "")
  - `collection_date` (string) (default: "")
  - `source` (string) (default: "")
  - `source_type` (string) (default: "")
  - `synchrotron_site` (string) (default: "")
  - `synchrotron_beamline` (string) (default: "")
  - `wavelengths` (array) (default: [])
  - `radiation_protocol` (string) (default: "")
  - `scattering_type` (string) (default: "")
  - `monochromator` (string) (default: "")
  - `resolution_high` (number, nullable)
  - `resolution_low` (number, nullable)
  - `reflection_count_observed` (integer, nullable)
  - `percent_possible_observed` (number, nullable)
  - `redundancy` (number, nullable)
  - `r_merge` (number, nullable)
  - `r_pim` (number, nullable)
  - `cc_half` (number, nullable)
  - `net_intensity_over_sigma` (number, nullable)
  - `wilson_b_estimate` (number, nullable)
  - `r_rim` (number, nullable)
  - `chi_squared` (number, nullable)
  - `measured_reflection_count` (integer, nullable)
  - `monochromatic_or_laue` (string) (default: "")
  - `observed_criterion_sigma_intensity` (number, nullable)
  - `r_sym` (number, nullable)
  - `ambient_temperature_details` (string) (default: "")
  - `reflection_count_all` (integer, nullable)
  - `observed_criterion_sigma_amplitude` (number, nullable)
  - `observed_criterion_amplitude_max` (number, nullable)
  - `observed_criterion_amplitude_min` (number, nullable)
  - `observed_criterion_intensity_max` (number, nullable)
  - `observed_criterion_intensity_min` (number, nullable)
  - `scaling_rejects` (integer, nullable)
  - `r_merge_amplitude` (number, nullable)
  - `net_intensity_over_average_sigma` (number, nullable)
  - `r_split` (number, nullable)
- `electron_microscopy` (object, nullable)
  - `@type` (string) (default: "RcsbElectronMicroscopy")
  - `reconstruction_method` (string) (default: "")
  - `aggregation_state` (string) (default: "")
  - `resolution` (number, nullable)
  - `resolution_method` (string) (default: "")
  - `symmetry_type` (string) (default: "")
  - `particle_count` (integer, nullable)
  - `selected_particle_count` (integer, nullable)
  - `microscope_model` (string) (default: "")
  - `electron_source` (string) (default: "")
  - `accelerating_voltage` (number, nullable)
  - `illumination_mode` (string) (default: "")
  - `imaging_mode` (string) (default: "")
  - `nominal_magnification` (number, nullable)
  - `nominal_defocus_min` (number, nullable)
  - `nominal_defocus_max` (number, nullable)
  - `detector_model` (string) (default: "")
  - `image_count` (integer, nullable)
  - `average_electron_dose_per_image` (number, nullable)
  - `ctf_correction_type` (string) (default: "")
  - `point_symmetry` (string) (default: "")
  - `cryogen_name` (string) (default: "")
  - `is_vitrified` (boolean, nullable)
  - `is_stained` (boolean, nullable)
  - `is_embedded` (boolean, nullable)
  - `is_shadowed` (boolean, nullable)
  - `assembly_names` (array) (default: [])
  - `assembly_types` (array) (default: [])
  - `assembly_sources` (array) (default: [])
  - `software` (array) (default: [])
    - `@type` (string) (default: "RcsbSoftware")
    - `name` (string) (default: "")
    - `version` (string) (default: "")
    - `classification` (string) (default: "")
    - `type` (string) (default: "")
    - `language` (string) (default: "")
    - `url` (string) (default: "")
    - `contact_author` (string) (default: "")
    - `contact_author_email` (string) (default: "")
    - `date` (string) (default: "")
  - `reconstruction_algorithm` (string) (default: "")
  - `class_average_count` (integer, nullable)
  - `specimen_concentration` (number, nullable)
  - `specimen_holder_model` (string) (default: "")
  - `alignment_procedure` (string) (default: "")
  - `c2_aperture_diameter` (number, nullable)
  - `nominal_cs` (number, nullable)
  - `calibrated_defocus_min` (number, nullable)
  - `calibrated_defocus_max` (number, nullable)
  - `recording_temperature_minimum` (number, nullable)
  - `recording_temperature_maximum` (number, nullable)
  - `tilt_angle_min` (number, nullable)
  - `tilt_angle_max` (number, nullable)
  - `cryogen_in_microscope` (string) (default: "")
  - `detector_mode` (string) (default: "")
  - `average_exposure_time` (number, nullable)
  - `diffraction_image_count` (integer, nullable)
  - `imaged_grid_count` (integer, nullable)
  - `vitrification_instrument` (string) (default: "")
  - `vitrification_humidity` (number, nullable)
  - `vitrification_chamber_temperature` (number, nullable)
  - `embedding_material` (string) (default: "")
  - `staining_material` (string) (default: "")
  - `staining_type` (string) (default: "")
  - `fitting_details` (string) (default: "")
  - `fitting_protocol` (string) (default: "")
  - `fitting_space` (string) (default: "")
  - `fitting_target_criteria` (string) (default: "")
  - `fitting_overall_b_value` (number, nullable)
  - `fitted_models` (array) (default: [])
    - `@type` (string) (default: "RcsbEmFittedModel")
    - `pdb_entry_id` (string) (default: "")
    - `pdb_chain_id` (string) (default: "")
    - `pdb_chain_residue_range` (string) (default: "")
    - `details` (string) (default: "")
  - `crystal_entities` (array) (default: [])
    - `@type` (string) (default: "RcsbEmCrystalEntity")
    - `dimensionality` (integer, nullable)
    - `space_group_name` (string) (default: "")
    - `space_group_number` (integer, nullable)
    - `length_a` (number, nullable)
    - `length_b` (number, nullable)
    - `length_c` (number, nullable)
    - `angle_alpha` (number, nullable)
    - `angle_beta` (number, nullable)
    - `angle_gamma` (number, nullable)
    - `c_sampling_length` (number, nullable)
  - `helical_entities` (array) (default: [])
    - `@type` (string) (default: "RcsbEmHelicalEntity")
    - `angular_rotation_per_subunit` (number, nullable)
    - `axial_rise_per_subunit` (number, nullable)
    - `axial_symmetry` (string) (default: "")
  - `diffraction` (object, nullable)
    - `@type` (string) (default: "RcsbEmDiffraction")
    - `camera_length` (number, nullable)
    - `resolution_high` (number, nullable)
    - `fourier_space_coverage` (number, nullable)
    - `measured_intensity_count` (integer, nullable)
    - `structure_factor_count` (integer, nullable)
    - `overall_phase_error` (number, nullable)
    - `overall_phase_residual` (number, nullable)
    - `phase_error_rejection_criteria` (string) (default: "")
    - `r_merge` (number, nullable)
    - `r_sym` (number, nullable)
- `nmr` (object, nullable)
  - `@type` (string) (default: "RcsbNmr")
  - `conformers_calculated` (integer, nullable)
  - `conformers_submitted` (integer, nullable)
  - `conformer_selection_criteria` (string) (default: "")
  - `representative_conformer` (string) (default: "")
  - `representative_selection_criteria` (string) (default: "")
  - `refinement_method` (string) (default: "")
  - `refinement_details` (string) (default: "")
  - `experiment_types` (array) (default: [])
  - `sample_contents` (string) (default: "")
  - `sample_solvent_system` (string) (default: "")
  - `sample_type` (string) (default: "")
  - `sample_states` (array) (default: [])
  - `ph` (number, nullable)
  - `ph_units` (string) (default: "")
  - `temperature` (number, nullable)
  - `temperature_units` (string) (default: "")
  - `pressure` (string) (default: "")
  - `pressure_units` (string) (default: "")
  - `ionic_strength` (string) (default: "")
  - `ionic_strength_units` (string) (default: "")
  - `sample_conditions_label` (string) (default: "")
  - `spectrometer_manufacturers` (array) (default: [])
  - `spectrometer_models` (array) (default: [])
  - `spectrometer_field_strengths` (array) (default: [])
  - `software` (array) (default: [])
    - `@type` (string) (default: "RcsbSoftware")
    - `name` (string) (default: "")
    - `version` (string) (default: "")
    - `classification` (string) (default: "")
    - `type` (string) (default: "")
    - `language` (string) (default: "")
    - `url` (string) (default: "")
    - `contact_author` (string) (default: "")
    - `contact_author_email` (string) (default: "")
    - `date` (string) (default: "")
  - `details` (string) (default: "")
  - `ensemble_representative_conformer` (string) (default: "")
  - `maximum_torsion_angle_constraint_violation` (number, nullable)
  - `ph_error` (number, nullable)
  - `temperature_error` (number, nullable)
  - `ionic_strength_error` (string) (default: "")
  - `pressure_error` (string) (default: "")
- `validation` (object, nullable)
  - `@type` (string) (default: "RcsbValidation")
  - `report_created_date` (string) (default: "")
  - `attempted_validation_steps` (string) (default: "")
  - `clashscore` (number, nullable)
  - `clashscore_full_length` (number, nullable)
  - `bonds_rmsz` (number, nullable)
  - `angles_rmsz` (number, nullable)
  - `percent_ramachandran_outliers` (number, nullable)
  - `percent_rotamer_outliers` (number, nullable)
  - `percent_rsrz_outliers` (number, nullable)
  - `data_completeness` (number, nullable)
  - `intensity_over_sigma` (string) (default: "")
  - `r_free_dcc` (number, nullable)
  - `r_dcc` (number, nullable)
  - `wilson_b_estimate` (number, nullable)
  - `twin_fraction` (string) (default: "")
  - `percent_ramachandran_outliers_full_length` (number, nullable)
  - `percent_rotamer_outliers_full_length` (number, nullable)
  - `b_factor_type` (string) (default: "")
  - `r_free_reflection_count` (integer, nullable)
  - `percent_free_reflections` (number, nullable)
  - `miller_index_count` (integer, nullable)
  - `acentric_outliers` (integer, nullable)
  - `centric_outliers` (integer, nullable)
  - `data_anisotropy` (number, nullable)
  - `wilson_b_anisotropy` (array) (default: [])
  - `eds_r` (number, nullable)
  - `eds_resolution_high` (number, nullable)
  - `eds_resolution_low` (number, nullable)
  - `fo_fc_correlation` (number, nullable)
  - `padilla_yeates_l_mean` (number, nullable)
  - `padilla_yeates_l2_mean` (number, nullable)
  - `bulk_solvent_b` (number, nullable)
  - `bulk_solvent_k` (number, nullable)
  - `translational_ncs_details` (string) (default: "")
  - `atom_inclusion_all_atoms` (number, nullable)
  - `atom_inclusion_backbone` (number, nullable)
  - `q_score` (number, nullable)
  - `primary_map_contour_level` (number, nullable)
  - `chemical_shift_completeness` (number, nullable)
  - `chemical_shift_completeness_full_length` (number, nullable)
  - `nmr_model_consistency` (string) (default: "")
  - `cyrange_domain_count` (integer, nullable)
  - `medoid_model` (string) (default: "")
  - `nmrclust_cluster_count` (integer, nullable)
  - `nmrclust_model_count` (integer, nullable)
  - `nmrclust_outlier_count` (integer, nullable)
  - `nmrclust_representative_model` (string) (default: "")
  - `rna_suiteness` (number, nullable)
  - `eds_r_warning` (string) (default: "")
  - `author_fsc_resolution_halfbit` (number, nullable)
  - `author_fsc_resolution_onebit` (number, nullable)
  - `author_fsc_resolution_threesigma` (number, nullable)
  - `author_fsc_resolution_0_143` (number, nullable)
  - `author_fsc_resolution_0_333` (number, nullable)
  - `author_fsc_resolution_0_5` (number, nullable)
  - `calculated_fsc_resolution_halfbit` (number, nullable)
  - `calculated_fsc_resolution_onebit` (number, nullable)
  - `calculated_fsc_resolution_threesigma` (number, nullable)
  - `calculated_fsc_resolution_0_143` (number, nullable)
  - `calculated_fsc_resolution_0_333` (number, nullable)
  - `calculated_fsc_resolution_0_5` (number, nullable)
- `model_details` (string) (default: "")
- `model_type_details` (string) (default: "")
- `molecular_replacement_status` (string) (default: "")
- `chemical_shift_status` (string) (default: "")
- `binding_affinities` (array) (default: [])
  - `@type` (string) (default: "RcsbBindingAffinity")
  - `component_id` (string) (default: "")
  - `type` (string) (default: "")
  - `value` (number, nullable)
  - `unit` (string) (default: "")
  - `reference_sequence_identity` (number, nullable)
  - `source` (string) (default: "")
  - `url` (string) (default: "")
- `molecule_features` (array) (default: [])
  - `@type` (string) (default: "RcsbMoleculeFeature")
  - `prd_id` (string) (default: "")
  - `name` (string) (default: "")
  - `type` (string) (default: "")
  - `feature_class` (string) (default: "")
  - `details` (string) (default: "")
- `deposit_groups` (array) (default: [])
  - `@type` (string) (default: "RcsbDepositGroup")
  - `group_id` (string) (default: "")
  - `description` (string) (default: "")
  - `type` (string) (default: "")
  - `aggregation_method` (string) (default: "")
- `twin_domains` (array) (default: [])
  - `@type` (string) (default: "RcsbTwinDomain")
  - `domain_id` (string) (default: "")
  - `fraction` (number, nullable)
  - `operator` (string) (default: "")
- `related_experimental_data` (array) (default: [])
  - `@type` (string) (default: "RcsbRelatedExperimentalData")
  - `data_set_type` (string) (default: "")
  - `data_reference` (string) (default: "")
  - `metadata_reference` (string) (default: "")
  - `details` (string) (default: "")
- `serial_crystallography` (object, nullable)
  - `@type` (string) (default: "RcsbSerialCrystallography")
  - `delivery_method` (string) (default: "")
  - `delivery_description` (string) (default: "")
  - `injection_description` (string) (default: "")
  - `injection_preparation` (string) (default: "")
  - `injection_carrier_solvent` (string) (default: "")
  - `injection_crystal_concentration` (number, nullable)
  - `injection_injector_diameter` (number, nullable)
  - `injection_injector_pressure` (number, nullable)
  - `injection_injector_temperature` (number, nullable)
  - `injection_flow_rate` (number, nullable)
  - `injection_jet_diameter` (number, nullable)
  - `injection_filter_size` (number, nullable)
  - `fixed_target_description` (string) (default: "")
  - `fixed_target_sample_holding` (string) (default: "")
  - `fixed_target_support_base` (string) (default: "")
  - `fixed_target_sample_solvent` (string) (default: "")
  - `fixed_target_sample_dehydration_prevention` (string) (default: "")
  - `fixed_target_sample_unit_size` (string) (default: "")
  - `fixed_target_crystals_per_unit` (integer, nullable)
  - `fixed_target_motion_control` (string) (default: "")
  - `fixed_target_velocity_horizontal` (number, nullable)
  - `fixed_target_velocity_vertical` (number, nullable)
  - `fixed_target_details` (string) (default: "")
  - `pulse_energy` (number, nullable)
  - `pulse_duration` (number, nullable)
  - `pulse_photon_energy` (number, nullable)
  - `photons_per_pulse` (number, nullable)
  - `source_size` (number, nullable)
  - `source_distance` (number, nullable)
  - `focal_spot_size` (number, nullable)
  - `collimation` (string) (default: "")
  - `collection_time_total` (number, nullable)
  - `beam_path_type` (string) (default: "")
  - `energy_bandwidth` (number, nullable)
  - `xfel_pulse_repetition_rate` (number, nullable)
  - `crystal_hits` (integer, nullable)
  - `droplet_hits` (integer, nullable)
  - `frame_hits` (integer, nullable)
  - `frames_total` (integer, nullable)
  - `frames_indexed` (integer, nullable)
  - `frames_failed_index` (integer, nullable)
  - `lattices_indexed` (integer, nullable)
  - `xfel_pulse_events` (integer, nullable)
  - `xfel_run_numbers` (string) (default: "")
- `solution_scattering` (array) (default: [])
  - `@type` (string) (default: "RcsbSolutionScattering")
  - `type` (string) (default: "")
  - `source_class` (string) (default: "")
  - `source_type` (string) (default: "")
  - `source_beamline` (string) (default: "")
  - `source_beamline_instrument` (string) (default: "")
  - `detector_type` (string) (default: "")
  - `buffer_name` (string) (default: "")
  - `sample_ph` (number, nullable)
  - `temperature` (number, nullable)
  - `concentration_range` (string) (default: "")
  - `protein_length` (string) (default: "")
  - `time_frame_count` (integer, nullable)
  - `mean_guinier_radius` (number, nullable)
  - `mean_guinier_radius_esd` (number, nullable)
  - `min_mean_cross_sectional_radius_of_gyration` (number, nullable)
  - `min_mean_cross_sectional_radius_of_gyration_esd` (number, nullable)
  - `max_mean_cross_sectional_radius_of_gyration` (number, nullable)
  - `max_mean_cross_sectional_radius_of_gyration_esd` (number, nullable)
  - `data_reduction_software` (array) (default: [])
  - `data_analysis_software` (array) (default: [])
- `solution_scattering_models` (array) (default: [])
  - `@type` (string) (default: "RcsbSolutionScatteringModel")
  - `method` (string) (default: "")
  - `software` (array) (default: [])
  - `software_authors` (array) (default: [])
  - `conformers_calculated` (integer, nullable)
  - `conformers_submitted` (integer, nullable)
  - `representative_conformer` (string) (default: "")
  - `conformer_selection_criteria` (string) (default: "")
  - `fitted_entries` (array) (default: [])
  - `details` (string) (default: "")

## Errors

### 422 — Validation Error

The request body did not validate

What to do: Check the fields against this schema. A URN with the wrong prefix is the most common cause.

- `detail` (array)
  - `loc` (array, required)
  - `msg` (string, required)
  - `type` (string, required)
  - `input` (any)
  - `ctx` (object)

### 408

The request ran past its time limit

What to do: Raise `timeout` in the request body, up to the maximum this endpoint documents. Lowering `count` or turning off the `with_*` flags also helps, because less work finishes sooner.

### 412

The entity was not found, or a precondition failed

What to do: Retrying will not help: either the entity does not exist, or the input points at a different one.

### 429

Too many requests: a rate limit or a usage window is exhausted

What to do: When the response carries an X-Retry-After header, wait that many seconds and retry: the same number is in the body as `detail.retry_after`, and the limit clears once that window passes. The message in the body names the limit that was hit.

### 500

Something broke on our side

What to do: Retrying will not help. If it keeps happening, send us the X-Request-ID from the response headers.

### 529

Rate limit reached, or the endpoint is overloaded

What to do: Wait at least 30 seconds, then retry.

## Response envelope

Success: Array of objects (may be empty if no results)

Error: Error may coexist with partial results if it occurs mid-execution. Check X-Error header and status code.

Every response carries these headers:

- `X-Error` — Error message text (present only on error)
- `X-Request-ID` — Unique request identifier
- `X-Execution-Time` — Execution time in seconds
- `X-Result-Count` — How many records the body carries. 0 means an empty result, which is a normal answer and not by itself an error. A non-zero count can come back together with X-Error when the failure happened partway through — read this header and X-Error independently.
- `X-Total-Available-Results` — How many records exist for this query, when the endpoint can say. On a `dry_run` request this is the answer and the body is empty. It saturates: the endpoint's documented maximum means 'at least that many', any smaller number is exact.
- `X-Warning` — Present when the request body carried keys this endpoint does not document. They were ignored, so any filter you meant to apply through them did not apply. Check the spelling against this schema and retry.
- `X-Retry-After` — Seconds to wait before retrying. Present only on 429.