Sequence Types and Features Ontology	Physico-Chemical Methods and Properties	Source
http://purl.obolibrary.org/obo/SO_0001117	http://purl.obolibrary.org/obo/FIX_0000319	LOOM
http://purl.obolibrary.org/obo/SO_0001118	http://purl.obolibrary.org/obo/FIX_0000320	LOOM