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The viability of Bel-7402 cells incubated with RGD-PEG-g-PEI-SPION/siRNA, PEG-g-PEI-SPION/siRNA, RGD-PEG-g-PEI-SPION/siNC or PEG-g-PEI-SPION/siNC at various N/P ratios. (means±SD; n = 3; *p<0.05, compared with RGD-PEG-g-PEI-SPION/siRNA).
