Systems Biology Ontology	Physico-Chemical Methods and Properties	Source
http://biomodels.net/SBO/SBO_0000581	http://purl.obolibrary.org/obo/FIX_0000279	LOOM
http://biomodels.net/SBO/SBO_0000647	http://purl.obolibrary.org/obo/FIX_0000270	LOOM