Sequence Types and Features Ontology OntoBiotope Source
http://purl.obolibrary.org/obo/SO_0000051 http://purl.obolibrary.org/obo/OBT_000385 LOOM
http://purl.obolibrary.org/obo/SO_0000338 http://purl.obolibrary.org/obo/OBT_000971 LOOM