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. 2019 Mar 14;15:25. doi: 10.1186/s13007-019-0412-1

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — PCA ordination plot for the triplicate reference-sample MALDI-TOF MS spectra of acid-soluble seed proteins from seeds collected in 2017 from (filled circle) Harmondsworth Moor, (filled square) Lampeter, (open circle) Rhosmaen, and (open square) Silwood Park. PCA analysis was unsupervised, and all peaks were weighted equally