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Histological sections of testis staining with toluidine blue (sections 0.85 µm). Unexposed group: 10× (a), and 40× (b). Group of 2mg/L TiO2-NPs: (c) 10×, and (d) 40×. Red * indicates the area occupied by spermatozoa into the tubules. Scale bar 260 µm.
