Fig. 4

Histological evaluation of anti-ulcer effect of methanolic extract of P. niruri. a Normal control, b Ethanol control, c 20 mg/kg omeprazole, d 100 mg/kg methanolic extract of P. Niruri , e 200 mg/kg methanolic extract of P. Niruri, f 400 mg/kg methanolic extract of P. Niruri. Each group was assessed at 400× magnification, scale bar: 20 μm; “I” indicates normal gastric mucosa, “J” indicates degeneration of gastric mucosa and infiltration of inflammatory cells frequently observed in the specimen from the stomach, “K” indicates almost complete regeneration of gastric mucosa