More specifically, they're components of triglyceride. So that's the major type of fat molecule that exists in adipose tissue. And so when we actually need glucose in our body, when we can get the glucose from food, our fat cells, the adipose tissue cells, basically begin breaking down these triglycerides to form fatty acids and glycerol molecules. Now, fatty acids cannot actually be used to form glucose molecules, and we'll discuss why in a future lecture. But the glycerol molecules can be used to form the glucose. And so the glycerol basically makes its way into the blood plasma and travels to our liver cells.