Figure 4. Photomicrograph at day 9 post-ulcer induction.

A) Control group: showing incomplete closure of the wound site and increased mitotic activity in the epithelium in addition to inflamed subepithelial connective tissues. B) CPC oral gel-treated group: showing closure of the ulcer site with atrophied vacuolated epithelium. C) NS-treated group: showing complete closure of the ulcerated site with normal epithelial lining. D): WGO-treated group: showing complete closure of the ulcerated site with normal epithelial lining (H&E x200).

CPC: cetylpyridinium chloride; NS: Nigella sativa; WGO: wheat germ oil; H&E: hematoxylin and eosin