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Influence of the molecular weight of PEI on the amount of loaded and released plasmids. (A) Amount of plasmid DNA loaded on the PEI-adsorbed electrode surface. (B) Amount of plasmid DNA released into PBS after the electrode was pulsed 1 to 4 times (each 10 ms duration) at the field strength of 75 V/cm. The data are expressed as a mean ± SD for three independent experiments.
