Figure 5: Immunohistochemical staining of penis. Positive areas of TGF-β1, fibronectin, and collagen type III were significantly more prominent in the TGF-β1 group than those in the control group. TGF-β1 in (a) TGF-β1 and (b) control groups; fibronectin in (c) TGF-β1 and (d) control groups; collagen type III in (e) TGF-β1 and (f) control groups. Arrow: positive areas. Images were obtained from rabbits euthanized at 20 days after TGF-β1 injection. TGF-β1: transforming growth factor β1.