And so what it does is it cleaves the peptide bond between the 15th and the 16th amino acid. Now, the 15th amino acid is arginine and the 16th amino acid is isolucine. So the bond holding these two amino acids is cleaved by Trypsin and this activates this Zymogen to form something we call pychiamitrypsin. Now, Pi chymatrypsin is not yet a fully functional enzyme. What Pi Chimetrypsin does is it goes on to other Pi Chimetrypsin molecules and it cleaves those molecules at several sites. And what it does is it ultimately removes two dipeptides from this molecule.