: GO_0000050http://purl.obolibrary.org/obo/ Create a prefix for http://purl.obolibrary.org/obo/ Hit Enter to save Double click to create a prefix | : hasDbXrefhttp://www.geneontology.org/formats/oboInOwl# Create a prefix for http://www.geneontology.org/formats/oboInOwl# Hit Enter to save Double click to create a prefix | Wikipedia:Urea_cycle |