Mass Spectrometry Ontology	General Formal Ontology for Biology	Source
http://onto.eva.mpg.de/ontologies/gfo-bio.owl#Atom	http://purl.obolibrary.org/obo/MS_1003034	LOOM
http://www.co-ode.org/ontologies/amino-acid/2005/10/11/amino-acid.owl#AminoAcid	http://purl.obolibrary.org/obo/MS_1003039	LOOM
http://onto.eva.mpg.de/ontologies/gfo-bio.owl#Molecule	http://purl.obolibrary.org/obo/MS_1000859	LOOM
http://onto.eva.mpg.de/ontologies/gfo-bio.owl#Protein	http://purl.obolibrary.org/obo/MS_1000882	LOOM
http://www.onto-med.de/ontologies/gfo.owl#Action	http://purl.obolibrary.org/obo/NCIT_C25404	LOOM