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In vitro cellular uptake of Alexa Fluor-488-labeled siRNA polyplexes by H1299/Luc cells at different N/P ratios (1, 2, and 5) and 20 pmol of siRNA when incubated for 6 h at 37 °C. (A) Untreated cells, free siRNA, and polymers G1 and G3. (B) Polymers G2A, G2B, G2C, and G2D.
