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Cross sections through the perineums of CNTFRα +/+ (A) and CNTFRα −/− (B) males. These sections were taken from mice with overall LA and BC muscle sizes close to their group means and are the single section from each animal with the greatest area of combined BC and LA. Dorsal is down. P, Base of penis; rec, rectum; LA, levator ani;BC, bulbocavernosus. Scale bar, 300 μm.
