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Agarose gel electrophoresis of NP/DNA complexes. Lane 1: DNA molecular weight marker; lane 2: naked plasmid DNA; lane 3: chitosan-coated PBCA-NPs; lanes 4–7 correspond to DNA with progressively increasing proportions of NPs at the charge ratio of 5:1, 10:1, 15:1, and 30:1 (w/w), respectively.
