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. 2021 Sep 13;11:18134. doi: 10.1038/s41598-021-97447-5

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© The Author(s) 2021

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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Amino acids isotopic value of Oculina patagonica from 30 m ('Deep', blue) and 2 m ('Shallow', red) water depth. Sample are DH (deep host), DS (deep symbiont), SH (shallow host) and SS (shallow symbiont). (A) Nitrogen isotopic value of two amino acids (glutamic-acid and phenylalanine) that are used for the calculation of the trophic position. (B) Carbon isotopic value of five essential amino acids (valine, leucine, isoleucine, methionine, and phenylalanine).