In vitro transfection efficiency for β-galactosidase DNA. FG•DNA(4:1), COMPcc•DNA (5:1), COMPcc•DNA(5 or 8:1)•FG, CSP•DNA(5:1), CSP•DNA(5 or 8:1)•FG, mTat•DNA(10:1) and mTat•DNA(10:1)•FG. a) * indicates p < 0.0001, comparison of control (DNA only), FG•DNA(4:1) etc, b)* indicates p < 0.0001 comparision of control (DNA only), CSP•DNA(8:1) etc. Data represents the mean β-galactosidase activity (relative light units, RLU)/well with a standard deviation obtained from quadruplicates.