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Figure 3: Terminal deoxynucleotidyl transferase-mediated triphosphate nick-end labeling-(TUNEL-) positive cells in seminiferous tubules of rats treated with vehicle (N), GB alone (GB), CIS alone (CIS), and the three GB-protected rats (CIS+L: 50 mg/kg GB; CIS+M: 100 mg/kg GB; CIS+H: 200 mg/kg GB). Photomicrographs show variable levels of apoptosis in different experimental groups Brown staining indicates TUNEL-positive cells. Tissues were counterstained with hematoxylin, 400x.