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Effects of IS on Nrf‐2 expression in HMEC‐1 cells: Histograms showing the Nrf‐2 level measured in control cells and cells treated with 0.5, 25 or 50 mg/L IS for 0, 24, 48 or 72 h. Data are expressed as the mean ± SD of three independent experiments. *p < 0.05.
