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. 2021 Apr 19;53(5):742–751. doi: 10.1038/s41588-021-00836-9

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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 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 — The relative ratio of maximum length of left-right axis to the total length was used here to indicate the degree of body pan flatness of fishes. The ratio was measured in three individuals for each species and the data are presented as mean values ± SD. The statistical difference between groups was calculated using Student’s t-test (two tails) with ‘***’ representing a statistical significance of P value < 0.001.

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