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Effect of hydrogen inhalation on serum expression of cytokines and chemokines. The expression of (A) IL-5, (B) IL-13, (C) MCP-1 and (D) IFN-γ. Data are presented as the mean ± standard error of the mean. *P<0.05 vs. the control group; §P<0.05 and §§P<0.01 vs. the AR group. H2, hydrogen gas; He, helium gas; AR, allergic rhinitis; IL, interleukin; MCP-1, monocyte chemoattractant protein-1; IFN-γ, interferon-γ.
