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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2015 May 6;26(7):1103–1114. doi: 10.1007/s13361-015-1125-y

Scheme 2.

Scheme 2

Mechanism of [M+H+O]+ formation via ion/ion reaction between peroxymonosulfate anion and an arginine-containing peptide and NH2OH loss from oxidized arginine side-chain.