Distribution of mucins in the gastrointestinal tract and in associated tissues
| Mucin | Distribution | Chromosomal location | Tandem repeat size (No of amino acids) |
| Secreted gel-forming | |||
| MUC2 | Small intestine, colon | 11p15.5 | 23 |
| MUC5AC | Stomach | 11p15.5 | 8 |
| MUC5B | Salivary glands, gallbladder | 11p15.5 | 29 |
| MUC6 | Stomach, duodenum, gallbladder, pancreas | 11p15.5 | 169 |
| MUC19 | Sublingual gland, submandibular gland | 12q12 | 19 |
| Secreted non-gel-forming (monomeric) | |||
| MUC7 | Salivary glands | 4q13-q21 | 23 |
| Cell surface | |||
| MUC1 | Stomach, gallbladder, pancreas, duodenum, colon | 1q21 | 20 |
| MUC3A/B | Small intestine, colon, gall bladder, duodenum | 7q22 | 17 |
| MUC4 | Colon, stomach | 3q29 | 16 |
| MUC12 | Colon, small intestine, stomach, pancreas | 7q22 | 28 |
| MUC13 | Colon, small intestine, stomach | 3q13.3 | 27 |
| MUC15 | Small intestine, colon, foetal liver | 11p14.3 | None |
| MUC16 | Peritoneal mesothelium | 19p13.3 | 156 |
| MUC17 | Small intestine, colon, duodenum, stomach | 7q22 | 59 |
| MUC20 | Colon | 3q29 | 18 |