Figure 3.

The activities of hepatic antioxidant capacity indicators in KO and WT mice. WT: wild-type (Period2^+/+) mice; KO: Per2 gene knockout (Period2^−/−) mice. Representative charts of the activities of superoxide dismutase (a, b), catalase (c, d), glutathione peroxidase (e, f), glutathione (g, h), and the concentration of malondialdehyde (i, j) were determined in liver tissues of Per2 knockout and wild-type mice as a function of liver weight and liver protein. ∗, P < 0.05, significant difference; ∗∗ or ∗∗∗, P < 0.01 or P < 0.001, extremely significant difference; NS, P > 0.05, without a difference. Data were shown as mean ± SEM; n = 6 biological replicates.