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. Author manuscript; available in PMC: 2010 May 6.
Published in final edited form as: J Am Chem Soc. 2009 May 6;131(17):6301–6308. doi: 10.1021/ja900094h

Figure 6.

Figure 6

MS/MS analysis of doubly modified species. (a) Melittin sequence and expected y" and b ions assuming double modification of tryptophan. (b) MS/MS spectrum of the (M+5H)5+ ion of the mass 3450 Da. Multiply charged ions have been transformed onto a singly charged x-axis to simplify spectral interpretation.