The protein-digesting enzyme secreted by the stomach wall in case of mammals is called

Pepsin is a stomach enzyme that serves to digest proteins found in ingested food. Gastric chief cells secrete pepsin as an inactive zymogen called pepsinogen. Parietal cells within the stomach lining secrete hydrochloric acid that lowers the pH of the stomach. In the small intestine, further digestion of protein is brought about by trypsin, chymotrypsin and carboxypeptidase.