Fig. 5. Neuronal nitric oxide synthase (nNOS) expression in the dorsal penile nerve. Representative images of nNOS in the dorsal penile nerve. (A) Red indi-cates nNOS and green indicates the penis dorsal nerve. Original magnifi-cation: ×400. (B) Mean intensity of nNOS for each group. *P<0.05 compared with the old group.
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