ID 3.4.23.30 DE pycnoporopepsin. AN proteinase Ia. CA Specificity similar to pepsin A, but narrower, cleaving only three bonds CA in the B chain of insulin: 14-Ala-|-Leu-15, 16-Tyr-|-Leu-17, CA and 24-Phe-|-Phe-25. CC -!- From the basidiomycete Pycnoporus sanguineus, formerly known as CC P.coccineus and Trametes sanguinea. CC -!- Formerly EC 3.4.4.17 and EC 3.4.23.6. //