Orthology Ontology Drosophila Gross Anatomy Ontology Source
http://purl.obolibrary.org/obo/FBbt_00000001 http://purl.org/net/orth#Organism LOOM
http://purl.obolibrary.org/obo/FBbt_00000001 http://purl.obolibrary.org/obo/NCIT_C14250 LOOM