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, 01:55, January 10, 2009
A '''glycoprotein''' is a macromolecule composed of a [[protein]] and a [[carbohydrate]] (a [[sugar]]). The carbohydrate is usually attached to the protein in a [[posttranslational modification]], at either [[asparagine]], [[hydroxylysine]], [[serine]], or [[threonine]].
Possible carbohydrates include [[glucose]], [[glucosamine]], [[galactose]], [[galactosamine]], [[mannose]], [[fucose]], and [[sialic acid]].