ColitisTrinitrobenzenesulfonic AcidDextran SulfateColonColitis, UlcerativePeroxidaseDisease Models, AnimalColitis, IschemicEnzyme InductionColitis, MicroscopicColitis, CollagenousColitis, LymphocyticCrohn DiseaseIntestinal MucosaInflammatory Bowel DiseasesMesalamineMice, Inbred C57BLRNA, MessengerCells, CulturedGene Expression RegulationMice, KnockoutSignal TransductionRectumEmbryonic InductionApoptosisMice, Inbred BALB CSulfasalazineCell LineTime FactorsCytokinesGastrointestinal AgentsColectomyProctocolectomy, Restorative