And this is what happens in step three. So once the isocitrate is formed, it is ready to undergo the first oxidative decorboxylation step. And this reaction is catalyzed by isocytrate dehydrogenase. Why dehydrogenase? Well, remember, a dehydrogenase is an enzyme that basically abstracts those electrons attached onto the H ion to basically form that reduced NADH molecule. So in this particular case, in the same exact way that we have a two step process here, we also have a two step process here.