differential permeabilization of the intracellular membranes could be demonstrated : at 0.040 mg of saponin/ml the plasma membrane was permeabilized , as assessed by the release of 50 % of the total cellular amount of lactate dehydrogenase , and at 0.20 mg/ml the endoplasmic reticulum was permeabilized , as measured by the release of 50 % of pulse-35s-labelled albumin .
C0021868
intracellular membranes
C0007634
cellular