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. Author manuscript; available in PMC: 2021 Jan 7.
Published in final edited form as: Anal Chem. 2019 Nov 26;92(1):252–266. doi: 10.1021/acs.analchem.9b05014

Figure 4.

Figure 4.

ETD product ion spectrum of the [M + 26H]26+ charge state of apomyoglobin followed by sequential ion/ion proton transfer (IIPT) reaction for (a) 0 ms, (b) 20 ms, (c) 40 ms, (d) 80 ms, and (e) 160 ms. Reprinted from Int. J. Mass Spectrom., Vol. 377, Anderson, L. C.; English, A. M.; Wang, W.; Bai, D. L.; Shabanowitz, J.; Hunt, D. F. Protein derivatization and sequential ion/ion reactions to enhance sequence coverage produced by electron transfer dissociation mass spectrometry, pp. 617–624 (ref 49). Copyright 2015, with permission from Elsevier.