And so this is what I'd like to focus on in this lecture. And I'd like to begin by focusing on a specific digestive enzyme found inside our body known as Chimetrypsin. Now, actually, we already spoke about Chimotrypsin in detail when we discuss proteases. And we said that Chimotrypsin is actually an example of a serene protease that breaks peptide bonds on the carboxyl side of specific amino acids, those amino acids that contain bulky hydrophobic aromatic side chains. Now, Chimetrypsin is initially synthesized in a Zymogen form in the inactive form. And the Zymogen form of China trypsin is known as Chimotrypcinogen.