The Drug Ontology Animal Natural History and Life History Ontology Source
http://www.owl-ontologies.com/unnamed.owl#Length_unit http://purl.obolibrary.org/obo/UO_0000001 LOOM
http://www.owl-ontologies.com/unnamed.owl#Mass_unit http://purl.obolibrary.org/obo/UO_0000002 LOOM