Biological interlocked Process Ontology for metabolism	National Drug File - Reference Terminology	Source
http://purl.obolibrary.org/obo/BiPOm#protein	http://purl.bioontology.org/ontology/NDFRT/N0000148318	LOOM
http://purl.obolibrary.org/obo/BiPOm#Activity	http://purl.bioontology.org/ontology/STY/T052	LOOM
http://purl.obolibrary.org/obo/BiPOm#Enzyme	http://purl.bioontology.org/ontology/STY/T126	LOOM
http://purl.obolibrary.org/obo/BiPOm#Chemical	http://purl.bioontology.org/ontology/STY/T103	LOOM