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. 2023 Jul 10;415(22):5487–5498. doi: 10.1007/s00216-023-04822-4

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© The Author(s) 2023

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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Fig. 2 — Peptide ratios with the strongest coefficient of determination (r²) per subgroup; a peptide ratio IKELTYQTEEDRK/EDQVMQQNPPKFDK for < 200 accumulated degree days (ADD), b peptide ratio KLEDEC[Carba]SELKR/AITDAAM[OX]M[OX]AEELKK for samples < 655 ADD, c peptide ratio INQQLDTK/TSVFVAEPK for the complete dataset (< 1535 ADD); displayed trendlines represent linear regression results; [Carba]: carbamidomethyl modification; [OX]: oxidation modification