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Knocking down of luciferase activity in K562 cells after 24 hr incubation with Luc-siRNA formulations. (A) LPEI and (B) LPEI (80%) +Tf-PEI (20%) tested at 1/1, 1.5/1 and 2/1 w/w ratios with Luc-siRNA as indicated under the x-axis. White bars represent luciferase activity (%) in comparison to untreated control cells (100%) obtained by using Luc-siRNA and gray bars represent activities obtained with siCONTROL. Data are mean and relative SD of 5 similar experiments
