Acting on peptide bonds (peptidases);
Hydrolysis of proteins with broad specificity similar to that of pepsin A, preferring hydrophobic residues at P1 and P1', but also cleaving Gly20!Glu in the B chain of insulin. Clots milk, and activates trypsinogen
From the imperfect fungus Penicillium janthinellum. In peptidase family A1 (pepsin A family). Closely related enzymes have been isolated from P. roqueforti  and P. duponti .
EC 18.104.22.168 created 1992 (EC 22.214.171.124 created 1992 (EC 126.96.36.199 created 1961 as EC 188.8.131.52, transferred 1972 to EC 184.108.40.206, modified 1981 [EC 220.127.116.11, EC 18.104.22.168, EC 22.214.171.124, EC 126.96.36.199, EC 188.8.131.52, EC 184.108.40.206 and EC 220.127.116.11 all created 1972 and incorporated 1978], part incorporated 1992)