following exposure of cells to 6 ng/ml insulin , the degree of activation of the insulin receptor kinase was lower in the plasma membrane fraction ( 24 % of the insulin effect at 500 ng/ml ) than in the low-density and high-density microsomal membrane fractions ( 54 and 77 % , respectively , of the insulin effect at 500 ng/ml ) .
C0007634
cells
C0007603
plasma membrane