Enzyme Reaction Ontology for annotating Partial Information of chemical transformation	Health Level Seven Reference Implementation Model, Version 3	Source
http://purl.bioontology.org/ontology/HL7/C1554215	http://reactionontology.org/piero/transformation	LOOM
http://purl.bioontology.org/ontology/STY/T126	http://www.kegg.jp/entry/enzyme	LOOM
http://purl.bioontology.org/ontology/STY/T044	http://reactionontology.org/piero/molecular_function	LOOM