in the present study , a lipid mixture containing only epidermal ceramides ( 40 % ) , cholesterol ( 25 % ) , palmitic acid ( 25 % ) , and cholesteryl sulfate ( 10 % ) , approximating the composition of stratum corneum lipids , formed stable , unilamellar liposomes when sonicated at 80 degrees c in buffer containing 100 mm nacl , 5 mm tris , and 1 mm edta at ph 7.5 .
C0014520
epidermal
C0221921
stratum corneum