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. Author manuscript; available in PMC: 2021 Apr 8.
Published in final edited form as: Chem Rev. 2019 Dec 18;120(7):3328–3380. doi: 10.1021/acs.chemrev.9b00440

Figure 13.

Figure 13.

UV photodissociation of two epimeric peptides: (a) [IQTGLDATHAER + H]+ and (b) [IQTGLDATHAER + 2H]2+. The d-form shows abundant −56 Da loss from Leu for both charge states. The downward arrow indicates the selected precursor ion. Reproduced with permission from ref 125. Copyright 2012 American Chemical Society.