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Immunohistochemical staining for NF-κB in testis samples. NF-κB expression in the (A) control, (B) 20 mg/kg cimetidine, (C) 40 mg/kg cimetidine and (D) 120 mg/kg cimetidine groups (counterstain with Mayer's hematoxylin; magnification, ×400; scale bar, 50 µm). The amount of cells expressing NF-κB was increased in the 120 mg/kg cimetidine group compared with that in the control group (arrows). NF, nuclear factor.
