Edited this part “Enteropeptidase is necessary for activation of all 3 pancreatic peptidases (trypsinogen → trypsin, chymotrypsinogen → chymotrypsin, carboxypeptidase a and b)” to reflect the following from the below source: “Enteropeptidase cleaves and activates pancreatic trypsinogen to trypsin, which in turn activates other digestive zymogens such as chymotrypsinogen, proelastase, procarboxypeptidase and prolipase in the lumen of the gut (Kunitz, 1939).”
Reference: https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/enteropeptidase