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Assessment of the uptake mechanism for PEI–SNAs, as determined by flow cytometry (top) or visualized by fluorescence microscopy (bottom). Data are average geometric means ± standard deviations. *p < 0.05 and **p < 0.005 relative to control cells by one-way ANOVA with post hoc Tukey. For fluorescence microscopy images, scale = 50 μm.
