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Hematoxylin and eosin staining of the inner ear on day 3 after irradiation. (A) Control group. (B) 50 mg/kg melatonin group. (C) 5 mg/kg melatonin+radiotherapy group. (D) 50 mg/kg melatonin+radiotherapy group. (E) Radiotherapy group. The outer hair cells in the radiotherapy group were slightly swollen and lightly stained (arrow). (Magnification = 40×).
