FUT2 and Crohn disease: In humans, the fucosyltransferase 2 (FUT2) gene is responsible for H-antigen expression in the intestine, and this structure has been shown to be particularly relevant in pathogen adhesion and for the susceptibility to chronic inflammation in the intestine, e.g., inflammatory bowel disease (IBD), Crohn’s disease (CD) and ulcerative colitis (UC) [2–3].