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. 2022 Aug 31;609(7925):77–82. doi: 10.1038/s41586-022-05017-0

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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. 1 — Foraminifer-bound N content (a) and FB-δ¹⁵N (b) for species-specific analyses in DSDP Site 516, ODP Site 872 and ODP Site 1211, complemented by data from mixed taxa and specific genera by Kast et al.¹⁸ for ODP Sites 1263 and 1209. Our compilation is of putatively symbiotic taxa or coarse fractions dominated by symbiotic taxa, avoiding the need to correct for the typical offset between symbiotic and symbiont-barren species^19,89. Cross-plots between δ¹⁵N and N content show no correlation.