Radiation Oncology Ontology	Sequence Types and Features Ontology	Source
http://purl.obolibrary.org/obo/SO_0000408	http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C37901	LOOM
http://purl.obolibrary.org/obo/SO_0001844	http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#C62220	LOOM