Radiation Biology Ontology	Epigenetic Entity	Source
http://purl.obolibrary.org/obo/GO_0000792	https://pat.nichd.nih.gov/patepigeneticentity/P00000140	LOOM
http://purl.obolibrary.org/obo/GO_0000785	https://pat.nichd.nih.gov/patepigeneticentity/P00000139	LOOM