2. Dietary proteins are digested into amino acids in the gastrointestinal ract Pepsin cleaves polypeptides into smaller peptides in stomach(N-terminal side ofY, F, W residues) Trypsin( C-terminal side of K, R) and chymotrypsin (C-terminal side of F, W, and Y)further cleave the peptides in small intestine Carboxypeptidase and aminopeptidase cleave the small peptides into amino acids. which are then absorbed and eventually delivered to liver2. Dietary proteins are digested into amino acids in the gastrointestinal tract • Pepsin cleaves polypeptides into smaller peptides in stomach (N-terminal side of Y, F, W residues). • Trypsin (C-terminal side of K, R) and chymotrypsin (C-terminal side of F, W, and Y) further cleave the peptides in small intestine. • Carboxypeptidase and aminopeptidase cleave the small peptides into amino acids, which are then absorbed and eventually delivered to liver