demethylase in the muscles, skin and visceral organs Formaldehyde: Induction of cross-linking of the ... flavor ↓ Bitterness by hypoxanthine Cathepsins Proteins , peptides Softening of tissue Chymotrypsin ... , trypsin , carboxy -peptidases Proteins , peptides Autolysis of visceral cavity (Belly- bursting) Calpain