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NCIt is NCI's reference terminology and core biomedical ontology. It covers some 100,000 key biomedical concepts with a rich set of terms, codes, definitions, and over 200,000 inter-concept relationships, and is used to code most NCI and caBIG® metadata and models. About 700 concepts are added each month in response to user requests and the requirements of dependent systems and applications, and much more content is similarly added to existing concepts. Many of these concepts include content created and maintained jointly with NCI's partners, making NCIt a shared coding and semantic infrastructure resources (see Shared Terminology Development of Terminology Contentsection).

NCI Metathesaurus (NCIm)

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