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. Author manuscript; available in PMC: 2016 Jan 31.
Published in final edited form as: J Mass Spectrom. 2015 Feb;50(2):418–426. doi: 10.1002/jms.3548

Figure 3.

Figure 3

The general process of generating radical peptides using collisional activation and electrostatic complexes. (a) The ion/ion reaction between doubly protonated RARARAA (denoted as M) and DR341, (b) collisional activation of the isolated reaction complex, (c) and CID of the resulting radical peptide. (d) The CID spectrum of [RARARAA+H]+ is provided for comparison. (e) The fragmentation of Direct Red 81 into DR341 is provided. The lightning bolt image indicates the precursor ion for each CID experiment. The “x2” in (c) implies that the [M+H]+ peak is twice the abundance displayed in the spectrum.