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To improve the transfection efficiency of polycations with DNA, we synthesized poly(ester–co–urethane)(PEU-g-PEI800) with short chain PEI800 in the side chain, and poly(ester–co–urethane)(PEU) without short chain PEI800. Both PEU-g-PEI800 and PEU, readily self-assembled with plasmid DNA (pCMV-βgal) in a HEPES buffer, were characterized by dynamic light scattering and zeta-potential. The results reveal...
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