Population and Community Ontology OntoBiotope Source
http://purl.obolibrary.org/obo/PCO_0000037 http://purl.obolibrary.org/obo/OBT_000823 LOOM
http://purl.obolibrary.org/obo/PCO_0000028 http://purl.obolibrary.org/obo/OBT_002697 LOOM