to examine possible feedback inhibition of insulin on proinsulin secretion , we measured serum proinsulin levels before and after 120 min of euglycemic hyperinsulinemia ( 90-100 mu/liter ) in 11 normal and 7 obese hyperinsulinemic subjects and 6 patients with beta-cell adenoma ( n = 4 ) , carcinoma , or hyperplasia .
C0021641
insulin
C0033362
proinsulin