And the second step, we actually have that diamondation step. So we deaminate, we remove the alpha amino group, and we form the ammonium, at which point this ammonium can now be fed into the urea cycle. Now, let's begin by focusing on just this reaction here. So we have transamination. transamination is catalyzed by an enzyme known as aminotransferase, and we also call it transaminase. But in this lecture, we're going to refer to it as simply aminotransferase.