RegenBase ontology	Radiation Oncology Structures Ontology	Source
urn:absolute:RadiationOncologyStructuresOntology#Spinal_Cord	http://regenbase.org/ontology#RB_0000370	LOOM
urn:absolute:RadiationOncologyStructuresOntology#Brain	http://regenbase.org/ontology#RB_0000335	LOOM
urn:absolute:RadiationOncologyStructuresOntology#Brainstem	http://regenbase.org/ontology#RB_0000505	LOOM