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Evaluating lentivirus transduction efficiency to HEK293T cells by EGFP expression. Lentivirus carrying EGFP was purified and concentrated by different methods, including PEG precipitation, ultracentrifugation (Ultra), PB precipitation, PS precipitation (0.2X, 0.5X, 1X, 2X, 4X). The actual chemical concentrations used are described in the "Materials and methods” section. All fluorescence images (left panel) were photographed under the same lighting
