So we begin with the target amino acid, and we have the alpha key to glutrate. As we saw in this particular case, this is catalyzed by aminotransferase. And so we ultimately form a glutamate and the alpha key to acid, in this case, pyruvate, in this case, oxalo acetate. Now, in the second step, that is catalyzed by glutamate dehydrogenase, the glutamate reacts with the NAD plus or NADP plus and water to basically form the alpha key to gluterate and that Ammonium. And so this Ammonium then goes into the urea cycle. It is used up, and so this reaction is driven in this direction.