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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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Fig. 2 — a, Phylogenetic relationship and divergence time among the flatfish species. The number in each node represents the divergence time among species and the red circle indicates the fossil record used for calibration in the node. The numbers with slashes, as well as the bars, represent the expanded and contracted gene families in this node, respectively. The silhouette image of each species was drawn according to their morphology using Adobe Illustrator software. b, Relative evolutionary rates of the flatfish species. Zebrafish was used as the outgroup and Platichthys stellatus as the reference species. The arrow represents the trend of the relative evolutionary rates. The colored ovals represent different fish groups that showed contrasted relative evolutionary rates.