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. 2020 Nov 11;10:19566. doi: 10.1038/s41598-020-76140-z

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© The Author(s) 2020

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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(a–f) Extracted ion chromatograms showing relative abundance of [M+Na]⁺ adducts of several iridoid glycosides identified in UK and Danish ash leaf extracts. Insets show low intensity EICs only for clarity. Venn diagrams showing relative distribution (fc threshold 1.5) of each compound between tolerant and susceptible genotypes of (g) UK trees and (h) Danish trees. Compounds shown in white have p value < 0.05 and compounds in yellow have p values < 0.1. 18 and 2 were only observed in 5/24 UK leaf extracts so are omitted from panel (g) and 20 was only observed in 7/18 Danish leaf extracts so is omitted from panel (h). Compounds proposed to be novel are boxed. 1–4 are P2/N2, P5, P1/N4 and P7, respectively from Sollars et al.²⁷.