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(A) The intracellular GSH levels of A549 cells and HepG2 cells were measured by a GSH assay kit. (B) Cellular GSH levels were determined by the mBCI-stained fluorescent intensity. (C) Reduction in Nrf2 expression decreased intracellular GSH levels. (D) Overexpression of Nrf2 in HepG2 cells increased intracellular GSH levels. * P<0.05, ** P<0.01.
