Human salivary mucin (MUC7) is characterized by a single polypeptide chain of 357 aa.
Detailed analysis of the derived MUC7 peptide sequence reveals five distinct regions or
domains:(1) an N-terminal basic, histatin-like domain which has a leucine-zipper
segment,(2) a moderately glycosylated domain,(3) six heavily glycosylated tandem repeats
each consisting of 23 aa,(4) another heavily glycosylated MUC1-and MUC2-like domain, ...