Fig. 2. Histological analysis of the urethra and corpus cavernosum. Repre-sentative images of Masson’s Trichrome staining in the urethra. (A) Red indicates smooth muscle, and green represents collagen. Original magnification: ×200. (B) Smooth muscle ratio for each group. Each bar shows the mean value (standard deviation). *P<0.05 compared with the old group.
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