Mucin 1 v MUCI is a glycoprotein with extensive O-linked glycosylation of its extracellular domain Y line the apical surface of epithelial cells in the lungs, stomach intestines eyes and several other organs protect the body from infection by pathogen binding to oligosaccharides in the extracellular domain, preventing the pathogen from reaching the cell surface Y Overexpression of MUCl is often associated with colon, breast ovarian, lung and pancreatic cancers 15Mucin 1  MUC1 is a glycoprotein with extensive O-linked glycosylation of its extracellular domain  line the apical surface of epithelial cells in the lungs, stomach, intestines, eyes and several other organs  protect the body from infection by pathogen binding to oligosaccharides in the extracellular domain, preventing the pathogen from reaching the cell surface  Overexpression of MUC1 is often associated with colon, breast, ovarian, lung and pancreatic cancers 15