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. Author manuscript; available in PMC: 2012 May 15.
Published in final edited form as: Anal Chem. 2011 Apr 14;83(10):3623–3626. doi: 10.1021/ac1026176

Figure 2.

Figure 2

The high resolution MS spectrum of a large peptide with a +4 charge (top) is unambiguously identified by high resolution detection of both singly and doubly charged MS/MS fragments (bottom).