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Cross sections of middle urethral segments and part of the anterior vaginal wall (a). Although ZF rats have a thicker urethral wall (b), smooth muscle layers (c), and striated muscle layers (d) compared to ZL rats, the ZL rats had a relatively higher ratio of striated muscle to smooth muscle (e), longer striated muscle fiber length (f), and more striated muscle layers (g) (n=12, P< 0.05).
