# Other types of O-glycan biosynthesis - Reference pathway

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O-linked glycosylation is the attachment of monosaccharides to the hydroxyl groups of amino acids, mostly serine and threonine, and is found in eukaryotes, archaea and bacteria. O-glycans exhibit diverse types of modifications where the innermost monosaccharide is N-acetylgalactosamine (map00512), mannose in mammals (map00515), and others (this map) including N-acetylglucosamine, fucose, glucose, galactose, mannose in yeast and arabinose in plants.

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