Figure 3: Flow cytometry of M2 macrophages at 1, 3 and 5 d. Note: (A) M2 macrophages are CD11b+ CD206+. Blue: CD206+ cells; purple: CD11b+ cells; red: CD206- and CD11b- cells. (B) The proportion of M2 macrophages decreased over time in all groups. The LPS reduced the proportion of M2 macrophage compared with control group. However, there was no statistically significant difference between LPS group and LPS + H2 group. *P < 0.05, vs. control group. LPS: Lipopolysaccharide; H2: hydrogen; d: day(s).