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. 2021 Jun 1;8:121. doi: 10.1038/s41438-021-00559-2

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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 Venn diagrams displaying the number of gene families shared among five species. b Phylogenetic tree constructed by 817 single-copy genes. The divergence time is given in millions of years in blue. The gene families that expanded and contracted are given in green and red, respectively. c, d Percentage distribution of Ks for orthologous and paralogous gene pairs. The x-axis denotes the Ks value. The y-axis denotes the percentage of gene pairs. Rate distributions were not corrected (c); Macleaya cordata rates were corrected for Coptis chinensis (d)