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Histological changes of the distal colons induced by 2, 4, 6-trinitrobenzenesulfonic acid 50% ethanol solution on day 7. (A and B) Presence of experimental colitis with ulcers after 2, 4, 6-trinitrobenzenesulfonic acid administration; (C) superficial inflammation of the colon after ethanol administration; (D) no histological changes in control after saline administration.
