And in the final step, we generate the NADH and we regenerate a coenzyme, the lipopemi, that we mentioned just a moment ago. So let's see exactly what that means. Let's begin with step number one. So, step number one is catalyzed by pyruvate dehydrogenase and it contains a prosthetic group we call Thyamine, pyrophosphate TPP. And this enzyme, the E one enzyme of this pyruvate dehydrogenate complex, uses this prosthetic group to actually attach onto that pyruvate molecule and at the same time remove a carbon dioxide. Now, this step is not actually a single step.