{
  "citation": "Specimen Registry v0.0.7 (2026). Maintained by Michael Gonzalez with AI assistance. https://specimenregistry.org. Data licensed under CC BY 4.0.",
  "license": "https://specimenregistry.org/license",
  "version": "0.0.12-neon",
  "specimen": {
    "id": "ust-ishim-1",
    "site_id": "ust-ishim-locality",
    "common_name": "Ust'-Ishim man (~45 ka anatomically modern human male, western Siberia)",
    "community_name": null,
    "catalog_number": "(femur fragment; museum accession pending Methods review)",
    "catalog_number_source_quote": null,
    "material_type": "skeletal remains (femur fragment)",
    "taxonomic_assignment": "Anatomically modern human (Homo sapiens)",
    "taxonomic_assignment_source_quote": null,
    "assignment_method": "aDNA-nuclear",
    "assignment_publication": "10.1038/nature13810",
    "provenance_publication": null,
    "stratigraphic_context": {
      "raw": "`{\"region\": \"western Siberia, Russia\", \"find_context\": \"eroded bank of Irtysh River near Ust'-Ishim, discovered 2008\"}`"
    },
    "stratigraphic_context_source_quote": null,
    "current_custody": null,
    "inferred_fields": null,
    "disputed_assignment": false,
    "verification_state": "draft",
    "verification_notes": null,
    "fts_tsv": "'45':4A 'anatom':6A,12B 'femur':19C 'fragment':20C 'homo':15B 'human':8A,14B 'ishim':2A 'ka':5A 'male':9A 'man':3A 'modern':7A,13B 'remain':18C 'sapien':16B 'siberia':11A 'skelet':17C 'ust':1A 'western':10A",
    "created_at": "2026-07-27T02:16:42.538Z",
    "updated_at": "2026-07-27T02:16:42.538Z"
  },
  "site": {
    "id": "ust-ishim-locality",
    "name": "Ust Ishim Locality",
    "country": "unknown",
    "region": null,
    "latitude": null,
    "longitude": null,
    "coordinates_precision": null,
    "site_type": null,
    "excavating_institution": null,
    "notes": null,
    "verification_state": "draft",
    "created_at": "2026-07-27T02:16:42.538Z",
    "updated_at": "2026-07-27T02:16:42.538Z"
  },
  "analyses": [
    {
      "id": "ae74ca7b-9589-4896-b297-0d9439c59b3f",
      "publication_id": "10.1038/nature13810",
      "method": "aDNA-nuclear",
      "dating_method": null,
      "lab": null,
      "analysis_date": null,
      "result_summary": "High-coverage whole-genome sequence of a ~45 ka modern-human male from western Siberia. Carries similar total Neanderthal ancestry to present-day Eurasians, but the introgressed tracts are substantially longer. Recombination decay on those tracts dates the Neanderthal → modern-human gene flow to 7–13 kyr before this individual lived (~50–60 ka). Provides autosomal, Y-chromosomal, and mitochondrial mutation-rate calibrations.",
      "result_summary_source_quote": null,
      "verification_state": "draft"
    }
  ],
  "comparisons": [
    {
      "id": 38,
      "specimen_a_id": "ust-ishim-1",
      "specimen_b_id": "oase-1",
      "comparison_type": "contemporaneous",
      "claim": "Ust'-Ishim (~45 ka Siberia) and Oase 1 (~37-42 ka Romania) both represent early Eurasian AMH; Ust'-Ishim predates and derives from a pre-East/West split population while Oase 1 shows a recent Neanderthal admixture episode.",
      "claim_source_quote": null,
      "method": null,
      "publication_id": "10.1038/nature13810",
      "quantitative_result": null,
      "verification_state": "pending-verification",
      "verification_notes": "Cross-ref added 2026-07-27 during block #9 Fu 2014 ingest.",
      "created_at": "2026-07-27T02:16:46.931Z",
      "updated_at": "2026-07-27T02:16:46.931Z",
      "other_id": "oase-1",
      "other_name": "Oase 1",
      "other_taxon": "modern human (Homo sapiens) with recent Neanderthal admixture"
    }
  ]
}