Figure 6

Illustration of the mechanisms of Yihuo Huatan Formula for treating chronic obstructive pulmonary disease. Abbreviations: YHF: Yihuo Huatan Formula; IFN-γ: interferon-γ; IL: interleukin; TNF-α: tumor necrosis factor-α; TGF-β1: transforming growth factor-β1; EGF: epidermal growth factor; EGFR: epidermal growth factor receptor; COPD: chronic obstructive pulmonary disease.