Aminosalicylic AcidsMesalamineColitis, UlcerativeColitisPhenylhydrazinesInflammatory Bowel DiseasesGastrointestinal AgentsAzathioprineCrohn DiseaseAnti-Inflammatory Agents, Non-SteroidalAnti-Inflammatory AgentsColitis, IschemicColitis, MicroscopicDextran SulfateColitis, CollagenousColonTrinitrobenzenesulfonic AcidColitis, LymphocyticIntestinal MucosaRectumSulfasalazinePeroxidaseColectomyProctocolectomy, RestorativeDisease Models, AnimalColonoscopyDysentery, AmebicIleostomyAdministration, RectalEnterocolitis, PseudomembranousPouchitisMice, Inbred C57BL