FamPlex RxNORM Source
http://purl.obolibrary.org/obo/FPLX_Protease http://purl.bioontology.org/ontology/RXNORM/8031 LOOM
http://purl.obolibrary.org/obo/FPLX_Fibrinogen http://purl.bioontology.org/ontology/RXNORM/4385 LOOM