although the chemical structure of the proinsulin cleavage products has not been established , human pancreatic kallikrein is considered a putative activator of proinsulin because of its location in the beta-cell , its preferential action on proinsulin and kininogen as compared to azocasein , and its capacity to generate insulin intermediate products that are further modified by human pancreatic kininase or bovine carboxypeptidase b .
C0033362
proinsulin
C0021641
insulin