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

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(a) Characteristic fragment ions derived from N-glycans containing NeuAc (Left), NeuGc (Middle), and both NeuAc and NeuGc (Right). (b) Full MS/MS spectra of rat serum N-glycan Hex₅HexNAc₄NeuAc₁NeuGc₁ (doubly protonated m/z 1120.40).