Now, the carbon source that it uses is bicarbonate. It uses a bicarbonate to basically take that carbon dioxide and place it onto the proponel coenzyme A. And that helps us generate the methylmelanyl coenzyme A. So it hydrolyzes. An ATP molecule takes that energy and uses that energy to basically help attach that carbon dioxide onto the ProPanel coenzyme A. And this entire process requires a vitamin B twelve molecule, vitamin B seven, known as biotin.