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In vitro gene transfection efficiencies of lPEI-25k/pGL2 polyplexes (pGL2 0.91 μg/ml, N/P = 60) in HeLa cells; the measurements were performed by using either pre-UV-treated (365 nm, 20 mW/cm2) pGL2 (2nd bar), or pre-UV-treated HeLa cells (3rd bar), for comparison with the non-UV-treated situation (1st bar). The data represent the mean and deviation between two independent experiments.
