And if the levels of the glucose drops, that can be very dangerous to those cells. Because, for instance, if our red blood cells cannot actually get the glucose from the blood because of the low levels of glucose in the blood, that can essentially lead to many, many different types of problems. And so what happens is the liver cells essentially begin to produce these glucose molecules from non carbohydrate molecules such as pyruvate and lactate and amino acid and glycerol molecules. And once we produce those glucose molecules, the cell's liver cells can release the glucose molecules into the blood and that will essentially maintain the proper glucose level in the blood. So this is basically the pathway that the liver cells in the kidney cells actually use to regulate and maintain the glucose levels in our blood. Now, one more thing I'd like to mention about insulin and glucagon is that these two different types of hormones also actually activate and inhibit certain types of gene expression.