Beta-carotene 15,15'-monooxygenase 1, or Beta-carotene oxygenase 1, is a human gene encoded by BCO1. It may also be known as: Beta,beta-carotene 15,15'-monooxygenase; Beta-carotene dioxygenase 1; Beta,beta-carotene 15,15'-monooxygenase ; BCDO; BCDO1; BCMO; BCMO1; BCO. The encoded protein is an enzyme with an amino acid length of 547 and a mass of 62.6 kDa. Other isoforms may exist. Beta-carotene 15,15'-monooxygenase 1 is a member of the Carotenoid oxygenase family. Homologs of this gene exist in other organisms, including: Chicken.