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The antiulcerogenic effect of diffractaic acid (DA) isolated from Usnea longissima, a lichen species, on indomethacin (IND)-induced gastric lesions was investigated in rats. Administration of 25, 50, 100 and 200mg/kg doses of DA and ranitidine (RAN) (50mg/kg dose) reduced the gastric lesions by 43.5%, 52.9%, 91.4%, 96.7% and 72.7%, respectively. It is known that oxidative stress leads to tissue injury...
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