Remember, it's glycogen synthase that initiates the elongation of glycogen. It builds the glycogen molecules. And so by inactivating this molecule, we stop glycogen synthesis from actually taking place. So this is what we mean by a reciprocal pathway. One of them is turned off or one of them is turned on, but the other one is turned off. So when we're fasting or when we're exercising, the blood glucose levels are low.