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The mRNA expression levels of (A) NRF2, (B) HO1, (C) SOD1, and (D) CAT were quantified by real-time polymerase chain reaction (PCR) in human gingival fibroblasts grown at different glucose concentrations for 72 h. Data are expressed as mean values ± SD; mean differences between groups were analyzed using the Tukey–Kramer test. *p < 0.05.
