It's by regulating pyruvate decarboxylation. So remember that inside the cytoplasm, glucose molecules undergo glycolysis to form pyruvate. And in the presence of oxygen, the pyruvate moves into the matrix of the mitochondria, where we undergo pyruvate to carboxylation. And what this produces is acetocoenzyme A. Now, once this step takes place, it's an irreversible step that commits the glucose derivative, the CETO coenzyme A to undergoing the citric acid cycle. Or in some cases, we can actually use it to form fat molecules, as we'll discuss in a future electron.