Now, once we actually form this isocitrate, now it is ready to actually undergo the first oxidative decarboxylation step that takes place in the citric acid cycle. So what we mean by an oxidative decarboxylation step is we actually have two reactions taking place. We have an oxidation reduction reaction, and we have a decarboxylation step. And this step three is catalyzed by the enzyme known as isocytrade, because that's the substrate molecule to the dehydrogenase enzyme. So isositrade dehydrogenase. And remember, whenever you hear the word dehydrogenase, what that means is we're going to have an oxidation reduction reaction, which electrons are going to be transferred onto a carrier molecule, in this particular case, the nicotine amide at any dinucleotide NAD plus.