Malate is then transformed back into oxyacetate and this step basically repeats itself. And these are the two important points that we have to focus on. These are the allosteric enzymes that our cells can actually use to regulate the rate at which the citric acid cycle takes place. And so to begin, let's focus on step three that is catalyzed by the allosteric enzyme isocitrate dehydrogenase. So we can break down step three into two steps. We have three A and three B.