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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

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Accession:HP:0011974 term browser browse the term
Definition:Replacement of bone marrow by fibrous tissue.
Synonyms:xref: SNOMEDCT_US:52967002;   UMLS:C0026987

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