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Histological examination of gastric tissue of different animal groups. Group I: control represented by (a,b), group II: ethanol-induced ulcer pretreated with physiological saline represented by (c,d), group III: ethanol-induced ulcer pretreated with oleuropein chitosan nanoparticles (CS NPs) represented by (g,h) and group IV: ethanol-induced ulcer pretreated with oleuropein solution represented by (e,f).
