And so if we essentially have many of these ATP molecules and citrate molecules, they will create a negative feedback loop that will go back and bind onto the phosphorptokinase and that will essentially diminish the activity of that phosphorptokinase. So if we have many ATP, this will stop the process of glycolysis so that we don't overproduce the ATP molecules. Now, one of the functions of liver cells that I mentioned earlier is the fact that they're responsible for actually maintaining a concentration, a normal concentration of glucose. Because if we have too many glucose in the blood, that can be toxic to our bodies. So let's suppose we just ingest a meal that is rich in carbohydrates and so the concentration of ATP in our blood essentially increases. And it's the job of the liver cells to basically uptake all that glucose to bring the blood level glucose back to normal.