Fig. 4.

Liver sections stained with Bcl-2, identified by a brown cytoplasmic reaction to Bcl-2 antibodies in the hepatocytes (arrows). A: Control group showing strong immunoreactions. B: Gallic acid-treated group showing strong Bcl-2 antibodies mainly in the cytoplasm of hepatocytes. C: Zinc oxide nanoparticles-exposed (ZNPs) group showing the moderate reaction of hepatocytes. D: Arsenic trioxide-exposed (ATO) group showing moderate labeling cells. E: ZNPs+ATO co-exposed group showing weak expression of hepatocytes to the stain. F: ZNPs+ATO+GA treated group showing the increased positive reaction of hepatocytes to the stain. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)