Now, in the second step that once again is not shown, that carbon dioxide is transferred from the biotin onto the Cecil coenzyme A molecule and we generate malanyl coenzyme A. So that's the importance of biotin. Biotin allows the binding of that carbon dioxide which ultimately transfers that carbon dioxide onto the CEO coenzyme A to form this Malnol coenzyme A. Now this step is very important for three reasons. Number one is it commits the CETO coenzyme A molecule. Number two is it's the rate limiting step.