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. Author manuscript; available in PMC: 2013 Feb 15.
Published in final edited form as: J Am Soc Mass Spectrom. 2011 Dec 1;23(2):201–212. doi: 10.1007/s13361-011-0288-4

Figure 2.

Figure 2

(a) CID fragmentation on the MALDI-TOF-TOF of the crosslinked synthetic peptide m/z 1988.2 (homodimer of AcQIGKGVAR) results in two major cleavage events at the intrinsic positive charges which are also observed in the first mass spectrum via in-source decay. (b) Pseudo MS3 of the fragment without an intrinsic positive charge produces a robust series of b- and y-ions which allows for peptide identifications