peripheral proinsulin ( 0.083 micrograms x kg-1 x min-1 ) and insulin ( 350 microu x kg-1 x min-1 ) levels 15- to 20-fold higher than insulin on a molar basis , based on previous observations that proinsulin has only 5-10 % the biologic potency of insulin .
C0021641
insulin
C0033362
proinsulin