consistent with integration of the antigen into the plasma membrane lipid bilayer , the exogenously supplied lipid was observed by immunofluorescence to diffuse rapidly ( d greater than or equal to 0.6 x 10 ( -8 ) cm2/sec ) over the surface of polykaryons formed between vesicle- and non-vesicle-treated cells .
C0007603
plasma membrane lipid bilayer
C0007634
cells