Digestion of protein starts in the stomach. The active pepsin formed by the action of HCl on inactive pepsinogen converts proteins into proteases and peptones. The digestion of proteins is continued in the small intestine by the action of certain enzymes present in the intestinal juice or succus entericus. The enzymes are trypsin chymotrypsin and carboxypeptides. These enzymes convert proteins peptones proteases into dipeptides and polypeptides. The dipeptides and polypeptides are the absorbable form of protein.