And now we have many steps to take place and ultimately we form that pyruvate molecule. And in the presence of oxygen, the pyruvate will enter the mitochondria and it will eventually form citrate intermediate molecules. And we also form ATP molecules after glycolysis. 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.