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Cell viability of the HR9 and HR9 /NS3 DNA treatment. HEK-293T cells were treated with 1 μg of the naked DNA, HR9 CPP/DNA complexes at different N/P ratios of 1:1, 2:1, 5:1 and 10:1, HR9 CPP at molar ratios of 1, 2, 5 and 10 as well as 70% ethanol as a positive control. The MTT assay was used to evaluate cytotoxicity. Data were presented as mean±standard deviations from two independent experiments.
