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. Author manuscript; available in PMC: 2006 Jan 25.
Published in final edited form as: J Am Soc Mass Spectrom. 2004 Nov;15(11):1545–1555. doi: 10.1016/j.jasms.2004.07.008

Figure 2.

Figure 2

Positive ion nHPLC/ESI/MS spectra summed over the chromatographic retention window in which complex glycopeptides a) N170 and b) N428(P)/431 eluted. The inset in panel a is for the ion corresponding to [(4▪) + ▴]3+. The inset in panel b is for the ion corresponding to [(3▪) + ▴]3+. Both insets are of spectra summed over the elution window of that component. For figure clarity, the peaks corresponding to other tryptic peptides/glycopeptides are not labeled. ▪ = GlcNAc-Gal, ♦ = sialic acid, and ▴ = fucose; the number before each symbol indicates how many of each are present. The superscripted number is the charge state. In the amino acid sequence B= carboxymethylcysteine.