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Normalized fluorescence intensity of PANC-1 cells after the uptake of peptide/DNA complexes at 4/1, 8/1 and 12/1 charge ratios labeled with YOYO-1. Values are the mean ± SEM of the mean of triplicates. * p < 0.05, ** p < 0.01 when compared with R6p/DNA polyplexes.
