The present invention relates to a novel mucin-type glycoprotein and to amethod forproducing the same. Specifically, the present invention provides a mucin-typeglycoproteinhaving a repeat structure which comprises 3 to 2000 repeating units eachhaving an amino acidsequence represented by the formula I: Val-Xaa-Glu-Thr-Thr-Ala-Ala-Pro[wherein Xaarepresents Val or Ile], wherein one or more amino acid residues in thestructure are bound to asugar chain consisting of one or more monosaccharides. The present inventionalso relates toa composition comprising the novel mucin-type glycoprotein. Furthermore, thepresentinvention relates to a molecular weight marker comprising the novel mucin-typeglycoprotein.
