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Western blotting to determine the expression of PI3K and p-AKT in NaIO3-treated ARPE-19 cells. ARPE-19 cells were pretreated with different concentrations of quercetin (1.25, 2.5, and 5 μM) for 1.5 h and then treated with NaIO3 (6 mM) for 24 h. Data were normalized to GAPDH. Values represent mean ± SD (n = 3). Data bars without letters in common (a–e) indicate a significant difference (p < 0.05).
