Now mucints are basically these heavily glycosylated proteins that are produced and released by the epithelial tissue, the epithelial cells of our body. Now heavily glycosylated basically means there are many oligosaccharides, many sugar molecules found attached onto these proteins. The reason, the question is why? Well, if we examine the protein sequence, the amino acid sequence of the protein will find a high density, a high number of serene and three ending residues. And it's these two residues that are basically needed to produce the old glycocytic bonds between the protein and the sugar molecule. So because mucins contain a high number of threeanine and steam residues, they are heavily glycosylated with the old glycositic linkages.