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. Author manuscript; available in PMC: 2013 Apr 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2012 Apr;23(4):708–717. doi: 10.1007/s13361-011-0332-4

Figure 1.

Figure 1

Figure 1

Mass spectra of the DEPC-modified peptide pGlu-HPG after allowing the peptide to sit in solution for (a) 10 min, (b) 4 h, and (c) 18 h after quenching the reaction with imidazole.