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In vitro gene transfection efficiency of the complexes of PEI/pDNA in COS7 cells in the presence of serum at different N/P ratios (A). Relative gene transfection efficiency of the complexes of LP/pDNA in COS7 cell line in the presence of serum at N/P of 10 (B), 20 (C) and 30 (D). Data represent mean ± standard deviation (* p < 0.05, ** p < 0.01, n = 2).
