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Levels of oxidative stress markers in the tissue: (a) hydrogen peroxide (H2O2), (b) nitrite and nitrate (NO2−/NO3−), (c) malondialdehyde (MDA), and (d) carbonyl proteins (CP) in the scar tissue of rats untreated and treated with doxycycline hyclate (Dx). C: control, Dx1 = 10 mg/kg Dx, and Dx2 = 30 mg/kg Dx. Data are represented as mean and standard deviation. The statistical difference compared to the group ∗C and &Dx1 (Student-Newman-Keuls test, p < 0.05).
