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. 2021 Jan 26;11:2184. doi: 10.1038/s41598-021-81986-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fragmentation spectra of peptide with two PTMs: phosphorylation and oxidation. Highlighted peaks represent peptide fragments. b-ions show fragments from the peptide N-terminus side (blue) and y-ions show fragments from the peptide C-terminus (orange). Fragments with modifications are highlighted with *: b15, b17, y2 and y4. The peptide is oxidated on methionine and phosphorylated on serine. The inset figure at the top shows all fragment ions detected.