MeSH note : a slowly activating form of chymotrypsinogen, forms chymotrypsin after tryptic cleavage;
formed by a limited proteolysis of bovine chymotrypsinogen A by added alpha-chymotrypsin;
further proteolysis at Asn 148-Ala 149 gives Ala-form & at Tyr 146-Thr 147 gives Thr-form;