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The success of gene therapy greatly depends on suitable gene carriers that should provide safe,efficient and targeted delivery.Among various types of carries for gene delivery,polyethyleneimine (PEI) is considered to be an effective non-viral gene carrier because of its high complexing abilities with DNA and siRNA,as well as excellent transfection efficiency.However,the use of PEI for gene delivery has only achieved limited success owing to its cytotoxicity and broad size distribution of its polyplexes.