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Tandem mass spectrum of hemagglutinin glycopeptide precursor ion 1013.7474 [M + 3H]3+, identified as NGSYPNLSK-[5,4,1,1,0]. Glycopeptide identifier is listed as peptide-[a,b,c,d,e], where a = number of hexoses; b = number of N-acetylhexosamines; c = number of deoxyhexoses; d = number of N-acetylneuraminic acids; e = number of N-glycolylneuraminic acids.
