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Objective It is generally accepted that 5-aminosalicylate (5-ASA; mesalamine), widely used in inflammatory bowel disease therapy, exerts its action from the intraluminal site of the intestine. In addition to local metabolism of 5-ASA, it has been assumed that therapeutic mucosal concentrations of 5-ASA depend on transporter-mediated secretion back to the lumen. Methods We tested the hypothesis that...
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