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Effects of different doses of H. oligocephalum on colonic TNF-α levels in acetic acid–induced colitis in rats [TNF-alfa, tumor necrosis factor-alpha; HOHE, H. oligocephalum hydroalcholic extract (100, 200, 400 mg/ kg); Dexa, dexamethasone (1 and 2 mg/kg); p.o., oral; i.p., intraperitoneal]. Values are expressed as mean ± SEM of six rats per group
