the presence of his-40 which interacts with asp-194 ( chymotrypsinogen numbering ) to stabilize other serine protease zymogens [ freer , s. t. , kraut , j. , robertus , j. d. , wright , h. t. , & xuong , n. h. ( 1970 ) biochemistry 9 , 1997 ] argues in favor of such a d precursor molecule .
C0008746
chymotrypsinogen
C0014436
zymogens