Fig. 6

Flow cytometry study of cellular uptake of polyplexes. Total fluorescence intensity (n = 3, error bars represent standard deviation) after a 60-min incubation of DyLight-633-labeled PEI 2 kDa, Pluronic-PEI, and Pluronic-PEI-DR5-TAT at different concentrations (0, 0.20, 0.40, 0.80 μM) in HeLa and HepG2 cells. Significance: **P < 0.01