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Effect of induction on the eGFP expression mediated by 100 μM CuSO4 in HeLa cells transfected with pRP.ExBi-MTIIa-hPSA-eGFP. Samples were collected at 0, 24, 36, 48, and 72 h after induction and the fluorescence of eGFP was measured. Non-induced cells were used as controls. Error bars indicate standard deviation.
