What known glands secrete enzymes that digest protein?

The primary glands that secrete enzymes for protein digestion are the pancreas and the stomach. The pancreas releases digestive enzymes such as trypsin and chymotrypsin into the small intestine, where they continue the digestion of proteins. The stomach secretes pepsin, which begins protein digestion in the acidic environment of the stomach. Together, these glands play a crucial role in breaking down proteins into smaller peptides and amino acids for absorption.