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Mucin is a type of protein produced by the cells of the epithelium, or the tissue that lines the cavities and structures of the body. Mucins are found in all types of animals and about 19 different genes have been found to code for mucins in humans.
Genes [edit]. At least 19 human mucin genes have been distinguished by cDNA cloning â MUC1, MUC2, MUC3A, MUC3B, MUC4, MUC5AC, MUC5B, MUC6, MUC7, MUC8, MUC12, MUC13, MUC15, MUC16, MUC17, MUC19, and MUC20.ature mucins are composed of two distinct regions: 1  The amino-and carboxy-terminal regions are very lightly glycosylated, but rich in cysteines. 2  A large central region formed of multiple tandem repeats of 10 to 80 residue sequences in which up to half of the amino acids are serine or threonine.