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sod (A), gpx (B), gr (C), cat (D), nrf2 (E), and keap1 (F) gene relative expressions levels and Nrf2 (G) protein relative expressions level of liver in the two groups before and after air exposure stress. Data are indicated as mean ± SEM (n = 6). Bars with different lowercase letters mean significant differences among groups (p < 0.05).
