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. Author manuscript; available in PMC: 2022 Feb 1.
Published in final edited form as: Anal Chem. 2019 Sep 25;91(20):13032–13038. doi: 10.1021/acs.analchem.9b03127

Figure 2.

Figure 2.

RDD fragmentation enables unambiguous identification of Glu and isoGlu containing peptides. Fragments common to all isomers are labelled in black. Fragments that positively identify Glu are labelled in blue, while fragments unique to isoGlu are labelled in red. Peaks in outer segments are normalized to the intensity of −56L peak.