Fig. 5. Expression levels of luciferase detected in 293T and NIH-3T3 cells treated with peptide/DNA complexes at various N/P ratios (A and C) and at an N/P ratio of 6 (B and D), respectively in each case. Data are presented as the mean ± SD (n = 3). DNA independent of peptide vector serves as a control. *p < 0.05; **p < 0.01; ***p < 0.005.
