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This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
Different concentrations of virus were co-transfected into 293T cells: 0.1 μL (a), 0.1 μL (b) and 0.01 μL (c). Cells grew well and strong fluorescence intensity was observed under the fluorescent microscope, suggesting that the virus packaging was successful.