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Gene therapy recently has become an important area of research as a new therapeutic method. In vivo and in vitro gene therapies require efficient delivery of genetic material into a cell and preferably high levels of expression of transferred gene. Traditionally, gene delivery systems are classified as viral vector-mediated systems and nonviral vector-mediated systems. Viral vectors, which have been demonstrated as systems with high transfection efficiency, however, are limited due to adverse effects such as immunogenicity, toxicity, limited DNA carrying capacity and mutagenesis caused by cell-infected viruses[1].
