two model membrane systems were used : ( 1 ) dipalmitoylphosphatidylcholine ( dppc ) bilayers and ( 2 ) bilayers composed of a mixture of phosphatidylcholine and phosphatidylglycerol at a molar ratio of 5:1 .
C0000039
dipalmitoylphosphatidylcholine
C1959616
phosphatidylcholine