CombiMag increases the transfection efficiency of lipid reagents in MEF cells. Different amounts of CombiMag [0 (control), 0.5, 1, and 2 μl] were added to the different transfection reagents. Histograms represent the effect of CombiMag on the transfection efficiencies of lipid reagents in MEF cells at 22 h. Bars represent the means ± sd of 4 cell fields. Student’s t test: *P < 0.05, **P < 0.005, ***P < 0.0005, ****P < 0.00005. Average number of cells counted was 200.