And so when we have high levels of ATP inside the matrix of the mitochondria, we don't want to actually produce any more ATP molecules. We want to stop the process of ATP synthesis. And so what happens is, when there are high levels of ATP in the matrix of mitochondria, that ATP act as an allosteric inhibitor of one of the enzymes of the citric acid cycle. So which enzyme? Isocytrade dehydrogenase. isocitric dehydrogenase basically transforms isocitrate into alpha ketoglutrate.