{
  "title": "UCSC Genome Browser API Structure",
  "description": "JSON structure documentation for the UCSC Genome Browser REST API key entities.",
  "entities": {
    "GenomeAssembly": {
      "description": "A genome assembly available in the UCSC Genome Browser.",
      "fields": {
        "name": "string — Assembly identifier (e.g., hg38)",
        "organism": "string — Common organism name",
        "scientificName": "string — Binomial scientific name",
        "description": "string — Assembly description",
        "sourceName": "string — Assembly source identifier",
        "taxId": "integer — NCBI taxonomy ID"
      }
    },
    "Track": {
      "description": "An annotation data track in the UCSC Genome Browser.",
      "fields": {
        "track": "string — Track name identifier",
        "shortLabel": "string — Short display label (max 17 chars)",
        "longLabel": "string — Full description label",
        "type": "string — Data type (bed, bigBed, bigWig, bam, etc.)",
        "visibility": "string(enum) — Default visibility (hide, dense, pack, full)",
        "html": "string — Track description page path"
      }
    },
    "SequenceResult": {
      "description": "A DNA sequence response for a genomic region.",
      "fields": {
        "genome": "string — Genome assembly identifier",
        "chrom": "string — Chromosome identifier (e.g., chr1, chrM)",
        "start": "integer — Start position (0-based)",
        "end": "integer — End position (1-based)",
        "dna": "string — DNA nucleotide sequence"
      }
    },
    "TrackHub": {
      "description": "A publicly registered UCSC Track Hub.",
      "fields": {
        "hubUrl": "string(uri) — Hub definition URL",
        "shortLabel": "string — Hub short label",
        "longLabel": "string — Hub description",
        "registrationTime": "string — Registration date",
        "dbCount": "integer — Number of genome databases in the hub"
      }
    }
  }
}