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. Author manuscript; available in PMC: 2018 Sep 1.

Published in final edited form as: J Am Soc Mass Spectrom. 2017 May 11;28(9):1765–1774. doi: 10.1007/s13361-017-1672-5

Scheme 1 — Proposed mechanism for the generation of dehydroalanine via ion/ion reaction between sulfate radical anion and multiply protonated protein ions and sequential generation of c- and z-ions N-terminal to dehydroalanine residues upon CID.^37,12

Scheme 1 — Proposed mechanism for the generation of dehydroalanine via ion/ion reaction between sulfate radical anion and multiply protonated protein ions and sequential generation of c- and z-ions N-terminal to dehydroalanine residues upon CID.^37,12