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Comparison of cell viability of polymers/siRNA complexes in HeLa cells stably expressing EGFP. The weight ratios of CS/PLA/siRNA, CS/siRNA, PLA/siRNA, and PEI (25 kDa)/siRNA were 5 : 0.5 : 1, 5 : 1, 5 : 1, and 2 : 1, respectively. Data are plotted in mean ± SD (n = 3). *Significantly different from the group treated with CS/PLA/siRNA complexes.
