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Source1

{
  "resourceType": "CodeSystem",
  "id": "nucleotide-dna",
  "meta": {
    "lastUpdated": "2026-03-23T00:00:00Z",
    "profile": [
      "http://hl7.org/fhir/StructureDefinition/shareablecodesystem"
    ]
  },
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "cg"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "informative"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 0
    }
  ],
  "url": "http://hl7.org/fhir/uv/cg-incubator/CodeSystem/nucleotide-dna",
  "version": "0.1.0-ci-build",
  "name": "NucleotideDNA",
  "title": "Nucleotide DNA Symbols",
  "status": "draft",
  "experimental": true,
  "date": "2026-03-23",
  "publisher": "HL7 International / Clinical Genomics",
  "contact": [
    {
      "name": "HL7 International / Clinical Genomics",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/clingenomics"
        },
        {
          "system": "email",
          "value": "clingenomics@lists.hl7.org"
        }
      ]
    }
  ],
  "description": "Single-letter symbols for DNA residues based on IUPAC nomenclature, including unambiguous, ambiguous, and N symbols.",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "content": "complete",
  "concept": [
    {
      "code": "G",
      "display": "Guanine",
      "definition": "G"
    },
    {
      "code": "A",
      "display": "Adenine",
      "definition": "A"
    },
    {
      "code": "T",
      "display": "Thymine",
      "definition": "T"
    },
    {
      "code": "C",
      "display": "Cytosine",
      "definition": "C"
    },
    {
      "code": "R",
      "display": "Purine",
      "definition": "G or A"
    },
    {
      "code": "Y",
      "display": "Pyrimidine",
      "definition": "T or C"
    },
    {
      "code": "M",
      "display": "Amino",
      "definition": "A or C"
    },
    {
      "code": "K",
      "display": "Keto",
      "definition": "G or T"
    },
    {
      "code": "S",
      "display": "Strong interaction (3 H bonds)",
      "definition": "G or C"
    },
    {
      "code": "W",
      "display": "Weak interaction (2 H bonds)",
      "definition": "A or T"
    },
    {
      "code": "H",
      "display": "Not-G (H follows G in the alphabet)",
      "definition": "A or C or T"
    },
    {
      "code": "B",
      "display": "Not-A (B follows A)",
      "definition": "G or T or C"
    },
    {
      "code": "V",
      "display": "Not-T/Not-U (V follows U)",
      "definition": "G or C or A"
    },
    {
      "code": "D",
      "display": "Not-C (D follows C)",
      "definition": "G or A or T"
    },
    {
      "code": "N",
      "display": "Any nucleotide",
      "definition": "G or A or T or C"
    }
  ]
}