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Schematic structure of the murine intestine and its different mucosal protection systems. Shown are stomach (Sto); proximal (pD), medial (mD), and distal parts of the duodenum (dD); jejunum (J); ileum (I); caecum (Cae); ascending/proximal (aC), transverse/medial (tC), and descending/distal colon (dC); rectum (R). The regions investigated in this study via RT-PCR are hatched. The predominant localization of the different intestinal protection systems is indicated.
