Example 1:digestive proteases Proteases involved in digestion of proteins in the stomach and small intestine are synthesized as inactive precursors (pancreas). They are activated by proteolytic digestion after secretion into the lumen of the intestine. TABLE 10.3 Gastric and pancreatic zymogens Site of synthesis Zymogen Active enzyme Stomach Pepsinogen Pepsin Pancreas Chymotrypsinogen Chymotrypsin Pancreas Trypsinogen Trypsin Pancreas Procarboxypeptidase Carboxypeptidase Pancreas Proelastase ElastaseExample 1: digestive proteases Proteases involved in digestion of proteins in the stomach and small intestine are synthesized as inactive precursors (pancreas). They are activated by proteolytic digestion after secretion into the lumen of the intestine