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. Author manuscript; available in PMC: 2022 Feb 18.
Published in final edited form as: Anal Chem. 2021 Nov 17;93(47):15728–15735. doi: 10.1021/acs.analchem.1c03652

Figure 5.

Figure 5.

Subsection of MS/MS spectra of Protein G [M + 28H]+28 with (a) 4 ms standard ETD and (b) 20 ms ETD-PIP. The products of both ETD reactions also underwent 30 ms IIPT. “Picket fence” signals are highlighted in red.