when two daily topical applications of four chromatographically separated lipid fractions ( cholesterol ester , free fatty acid , cholesterol , and sphingolipid ) from the scl were carried out at 1 % concentration in the same system , the cholesterol ester and sphingolipid fractions were found to induce a significant increase in the conductance value over no application .
C0008377
cholesterol
C0008387
cholesterol ester