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With the goal of developing non-viral techniques for exogenous gene delivery into mammalian cells, we have studied receptor-mediated gene transfer using complexes of plasmid DNA and galactosylated poly-L-lysine, poly(L-Lys)Gal. To evaluate the optimal parameters for efficient gene transfer into human hepatoma HepG2 cells by the DNA–poly(L-Lys)Gal complexes, the bacterial reporter genes lacZ and cat...