From the list of IBD-related genes, those that were not differentially expressed in the colon epithelium were: Tnf, Il6, Il22, Ccl-4, 7, 11, 17, and 20, Cxcr3, Cxcl-1, 5 and 10; Mmp-7, 9, and 14, Timp1, regenerating islet-derived 3γ (Reg3γ), pancreatitis-associated protein (Pap), ATP-binding cassette, subfamily B (MDR/TAP), 1a (Abcb1a), and prostaglandin-endoperoxide synthase 2 (Ptgs2). Here, PTGS2 is linked to inflammatory bowel disease.