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Transfection rates of MDCK cells, normalized with the values obtained for lipofection experiments, using SLNs coated with DNA (a); DNA + chitosan: DC (b); D–C–D (c); D–C–D–C (d); D–C–D–C–D (e); D–C–D–C–D–C (f); D–C–D–C–D–C–D (g); and D–C–D–C–D–C–D–C (h); black bars represent the SLNs having the chitosan as the last layer [98].
