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In vitro transfection efficiency of transfection reagent (TR)/SSO complexes at different ratios (v/w) in MDA-MB-231 cells. Cells were transfected with TR/DNA complexes in the absence of serum with three different amounts of SSO. L3K: Lipofectamine 3000, L2K: Lipofectamine 2000. * p < 0.01.
