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Deamination of a glycopeptide with N-terminal glutamine with MALDI-DIT collision-induced dissociation MS/MS. C*, cysteine with heavy label; D, aspartic acid; P-17, peptide with loss of 17 Da; T, threonine; V, valine. Blue square, GlcNAc (N-acetyl-glucosamine); Green circle, Man (mannose); yellow circle, Gal (galatcose).
