* Trypsinogen
* Chymotrypsinogen
* Procarboxypolypeptidase

Trypsinogen

When first synthesized in the pancreatic cells, the proteolytic digestive enzymes are in the inactive forms of:




which are all inactive enzymatically. They become activated only after they are secreted into the intestinal tract

- activated by an enzyme called , which is secreted by the
intestinal mucosa when chyme comes in contact with the mucosa

enterokinase

Chymotrypsinogen

- activated by trypsin to form chymotrypsin

Procarboxypolypeptidase

- which is also activated in a similar manner