Fig. 6. Effect of HED on the expression levels of TGF-β1 and collagen I in the hearts of mice in each group. (A) Changes in TGF-β1 expression under immunohistochemical staining. A brown colour indicates positive expression of TGF-β1. (B) Immunohistochemical staining of collagen I. A brown colour indicates positive expression of collagen I. db/db group vs. db/m group, *P < 0.05; db/db + HED groups vs. db/db group, **P < 0.05.
