Figure 1: The morphology and growth of macrophages in vitro in different groups at 1, 3 and 5 d. Note: The normal Raw264.7 cells were round in shape. After lipopolysaccharide treatment, most cells became spindle-shaped, and the growth rate decreased over time. After 60% hydrogen treatment, the cell morphology and growth rate partly recovered. LPS: Lipopolysaccharide; H2: hydrogen; d: day(s). Scale bars: 20 μm.