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(a) Histograms representing the data and (b) average fluorescence as assessed by flow cytometry. Uptake of fluorophore, non-functionalized polyplexes, polyplexes plus free fluorophore, and fluorophore-functionalized polyplexes was monitored in HeLa cells. Data is presented as mean ± SD, n = 4. Statistically significant (P<0.05) differences are indicated with a (*).
