UMLS Semantic Types Ontology
https://bioregistry.io/registry/styhttps://www.nlm.nih.gov/research/umls/knowledge_sources/metathesaurus/release/license_agreement.html
UMLS Semantic Network The Semantic Network consists of (1) a set of broad subject categories, or Semantic Types, that provide a consistent categorization of all concepts represented in the UMLS Metathesaurus, and (2) a set of useful and important relationships, or Semantic Relations, that exist between Semantic Types.
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