at the three life stages studied ( 21 , 38-40 and 75-80 days ) binding specificity in testicular solubilized membranes showed the following order of competition relative to porcine insulin ( 100 ) : proinsulin ( 7 ) , guinea-pig insulin and igf-i ( less than 1 ) .
C0033362
proinsulin
C0021641
insulin