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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

Product ion spectra derived from CID of complexes produced via ion/ion reactions between doubly protonated substance P (RPKPQQFFGLM) and (a) HSO₅⁻, (b), HS₂O₈⁻, and (c) SO₄^−•. The lightning bolt ( ) indicates species subjected to CID.

Inline graphic — Product ion spectra derived from CID of complexes produced via ion/ion reactions between doubly protonated substance P (RPKPQQFFGLM) and (a) HSO₅⁻, (b), HS₂O₈⁻, and (c) SO₄^−•. The lightning bolt ( ) indicates species subjected to CID.