And these digestive enzymes are initially created in their zymogen form. And that's important because we don't want the digestive enzymes to be activated at all times. We only want to activate these digestive enzymes when we're actually digesting, when we actually eat the food. So we have these two organs, we have the pancreas in the stomach that basically synthesize a variety of different types of zymogens. And to activate these zymogens we have to undergo the process of proteolytic cleavage, proteolytic activation. And only then when we activate these zymogens can these enzymes actually function and digest, break down all the different types of macromolecules that we ingest into our body.