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. 2022 May 2;6(7):866–877. doi: 10.1038/s41559-022-01740-z

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© The Author(s) 2022

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Extended Data Fig. 4 — Matrix-assisted laser desorption/ionization mass spectrometry image from a Mediterranean P. oceanica root cross-section collected off the Island of Elba, Italy. The ion image shows the presence of the phenolic compound, identified as caffeic acid (C₉H₈O₄, [M-H]^-, m/z 179.0354; Supplementary Fig. 7). Relative ion abundances are visualized from low (blue) to high (yellow).