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glycoprotein

A macromolecule consisting of a protein backbone along which short oligosaccharide branches are attached at intervals. The most important plant glycoprotein is extensin,  a structural component of cell walls. The pro-tein backbone of extensin is unusual in that it contains a large number of *hydroxyproline residues (about 30% of the total amino acid residues). The hydroxyproline serves to provide attachment points for the carbohydrate chains - in extensin these side chains are tetrasaccharides of arabinose.
 
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