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Lipid-linked oligosaccharide (LLO)

A poly- or oligosaccharide attached to dolichol and anchored in the ER membrane. In the context of N-glycosylation, the LLO is built by the sequential attachment of sugars to dolichol pyrophosphate (Dol-PP) to form a 14-sugar (Glc3Man9GlcNAc2) oligosaccharide; this oligosaccharide is transferred to proteins during N-glycosylation.