Answer:
aspartic protease
Explanation:
Pepsin is an aspartic protease, using a catalytic aspartate in its active site. It is also one of three principal proteases in the human digestive system, the other two being chymotrypsin and trypsin.
chymotrypsin
a digestive enzyme which breaks down proteins in the small intestine. It is secreted by the pancreas and converted into an active form by trypsin.
trypsin
a digestive enzyme which breaks down proteins in the small intestine, secreted by the pancreas as trypsinogen.
