Shown is a branched oligosaccharide made of three sugars
An oligosaccharide is a polymer of a few different simple sugars. Oligosacchardides are carbohydrates. When they are hydrolized, oligosaccharides give 2 to 9 monosaccharides.
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An example of N-linked oligosaccharide, shown here with GlcNAc. X is any amino acid except proline.
An example of O-Linked oligosaccharide with β-Galactosyl-(1n3)-α-N-acetylgalactosaminyl-Ser/ Thr.