And then we transform the Chimotryptin into the active enzyme known as Pychiamitrypsin. And then when Pi Chimotrypsin reacts with another Pi Chimotrypsin, we cleave it at yet another location. So basically, we remove two dipeptides from this location and this location and we form the final active molecule, our chimotryptin. And then this chimetryptsin can basically react with polypeptides, cleave them at specific locations in the small intestine and then we can ingest those molecules into the cells of our body. So this process is known as proteolytic cleavage or proteolytic activation. Now let's move on to reversible covalent modification.