It involves different types of enzymes and also involves different types of steps. And actually, we have four steps in pyruvate carboxylation, and three steps are actually required to form that acetyl coenzyme A complex, as we'll see in just a moment. But before we look at the details of these four steps, let's actually discuss what components we find in the pyruvate dehydrogenase complex. So this complex actually consists of three different enzymes and also uses five different Co enzymes. So let's begin by focusing on the enzyme. So enzyme number one, known as E one, is Pyruvate dehydrogenase.