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Summary of general structures of the mucin O-glycans in the different parts of the gastrointestinal tract. Stomach (on Muc5ac) (A); duodenum, jejunum, and ileum (on Muc2) (B); proximal colon (Muc2) (C); and distal colon (on Muc2) (D). The right-hand GalNAc is attached to the amino acids serine (S) or threonine (T). Square brackets denote that these residues can appear 0, 1, or 2 times as indicated by the italic subscript numbers.
