unilamellar vesicles composed of phosphatidylcholine ( pc ) and either phosphatidic acid ( pa ) or phosphatidylglycerol ( pg ) partition to the upper poly ( ethylene glycol ) ( peg ) -rich phase of a charge-sensitive 5 % :5 % ( w/w ) peg 8000/dextran t-500 phase system containing 10 mm sodium phosphate at ph 7 , consistent with the vesicles bearing a net negative charge .
C0032483
poly ( ethylene glycol
C0030776
peg