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Various polymers were used as transfection factors for small interfering RNA (siRNA) to effectively suppress human cytotoxic T-lymphocyte antigen 4-immunoglobulin (hCTLA4Ig) gene in transgenic rice cells. Five kinds of polymers (PEI, PVA, PVP, and 8 and 20 kDa PEGs) were applied for delivery of siRNA with lipofectamine used as a control. In the cytotoxicity test, all polymers except 8 kDa PEG showed...
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