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. 2015 Aug 7;5:12844. doi: 10.1038/srep12844

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(a) Diagnostic fragment ions generated from N-glycans with O-acetylated NeuAc (Left) and O-acetylated NeuGc (Right). (b–e) Full MS/MS spectra of a series of N-glycans with varied numbers (0–3) of acetylation sites on NeuAc and (f) N-glycan Hex₅HexNAc₄NeuAc₁ NeuGc₁ + OAc.