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. Author manuscript; available in PMC: 2010 Oct 25.
Published in final edited form as: Eur J Mass Spectrom (Chichester). 2010;16(3):421–428. doi: 10.1255/ejms.1028

Figure 2.

Figure 2

ETD spectrum of m/z 733.0369(3+), corresponding to AAT(GalNAcGalSA)LSTLAGQPLLER. This spectrum provides sufficient information for confident sequence identification as well as site assignment. Sialic acid loss from charge-reduced versions of the precursor ion was also detected. Fragments labeled with asterisk indicate hydrogen transfer, i.e. z+1 ions.