So protein C, interestingly, is actually activated by thrombin. And thrombin is that very same molecule that is used to actually form fibrin from fibrinogen. And fibrin is used to form the blood clots. So thrombin has a dual purpose. It not only actually forms the blood clots, but it also is responsible for inhibiting the coagulation process by activating protein C, because what protein C does is it breaks down and digests two important stimulating proteins, part of that coagulation cascade, namely factor five and factor eight. Now, factor five, if we remember from the previous several lectures, is basically that stimulating protein that binds onto factor ten and that activates thrombin.