. "\"A protein complex that possesses cytochrome o ubiquinol oxidase activity; consists of four polypeptide subunits and associated prosthetic groups.\" [GOC:mah, MetaCyc:CYT-O-UBIOX-CPLX, PMID:11017202, PMID:3052268]" . . "cytochrome o ubiquinol oxidase complex" . "MetaCyc:CYT-O-UBIOX-CPLX" . "See also the molecular function term 'cytochrome o ubiquinol oxidase activity ; GO:0008827'." . . .