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. Author manuscript; available in PMC: 2014 Nov 15.

Published in final edited form as: Int J Mass Spectrom. 2013 May 31;354-356:181–187. doi: 10.1016/j.ijms.2013.05.022

CID of (a) Path 1 formed by deguanidination and (b) Path 2 formed by concerted losses of H₂O and NH₃, both formed from CID of [M_R+B+H]⁺, where M_R is the peptide Ac-RARARAA. The activated peaks are labeled with a lightning bolt () and covalently-modified peaks that have lost both H₂O and NH₃ are labeled with a hollow diamond (◇). Independent water losses are labeled with degree signs (°) and independent ammonia losses are labeled with astericks (*).

Inline graphic — CID of (a) Path 1 formed by deguanidination and (b) Path 2 formed by concerted losses of H₂O and NH₃, both formed from CID of [M_R+B+H]⁺, where M_R is the peptide Ac-RARARAA. The activated peaks are labeled with a lightning bolt () and covalently-modified peaks that have lost both H₂O and NH₃ are labeled with a hollow diamond (◇). Independent water losses are labeled with degree signs (°) and independent ammonia losses are labeled with astericks (*).