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. Now, some examples of digestive enzymes in their zymogen form are listed on the board. So we have trypsinogen, which is the zymogen form of trypsin. We have chymatrypsinogen, which is the zymogen form of chimetryptin.