Systems Biology Ontology	Ontology of Chemical Elements	Source
http://purl.obolibrary.org/obo/CHEBI_25212	http://biomodels.net/SBO/SBO_0000299	LOOM
http://purl.obolibrary.org/obo/BFO_0000040	http://biomodels.net/SBO/SBO_0000240	LOOM