There is a build up of isocitrate, and Isacitrate is pretty much at equilibrium with citrate because this reaction is essentially at equilibrium. And so the isocitrate, once there's a build up of isocitrate, there will also be a build up of the citrate molecule. And the citrate molecule, as it builds up, it moves into the cytoplasm of our cells from the matrix of the mitochondria. And in the cytoplasm, if you remember back to regulation of glycolysis, the citrate actually inhibits a specific type of enzyme in glycolysis, which inhibits the rate at which glycolysis decreases the rate at which glycolysis actually takes place. And the citrate can actually be used to form fat molecules, as we'll discuss in the future lecture. Now, let's move on to step four.