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Forty-eight hours after transfection, EGFP positive cells were detected by fluorescence microscopy (× 100). A: HepG2 cells transfected with pEGFP-Sp; B: HepG2 cells transfected with pEGFP-Cp; C: HepG2 cells transfected with pEGFP-Xp; D: HepG2 cells transfected with pEGFP-preSp.
