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Luciferase expression in 3T3 cells transfected with the pCMVL gene. Cells were incubated with 3 μg of plasmid complexed with 18 μg of K19-P3 (open bar), 10 equivalents of PEI nitrogen per DNA phosphate (shaded bar), or 18 μg of 19-residue polylysine (solid bar). Experiments were done in triplicate and the results show the average ± SEM of five experiments.
