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BackgroundPolyethylenimine (PEI) polyplexes mediate efficient gene transfer only at high +/− charge ratios at which free noncomplexed PEI is present. The excess of PEI gives polyplexes a positive surface charge that plays a role in polyplex binding on the cell membrane. Although positively charged PEI polyplexes are known to interact with anionic cell‐surface glycosaminoglycans (GAGs), the exact role...
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