Fig. 3. (A) Masson trichrome staining for collagen (blue) and smooth muscle (red) in corporal tissue. Enzymatic nitric oxide synthase (nNOS) (red) and dorsal nerve (green) (×100). (B) Smooth muscle distribution ratio. Data are expressed as mean±standard deviation. ^*Significant difference between the control and goji groups (p<0.05). ^aNormal control group (n=8), ^bgoji extract at 150 mg/kg/day group (n=8), and ^cgoji extract at 300 mg/kg/day group (n=8).