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. 2021 Apr 28;592(7856):747–755. doi: 10.1038/s41586-020-03040-7

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© The Author(s), under exclusive licence to Springer Nature Limited 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 — Bar graphs were created from dot plots. a, Additional scaffold in sea lamprey (scaffold 49) with a VTR gene is most syntenic with chromosomes of other species containing a VTR1-VTR2 combination, with a 3-gene minimum per 20-gene window criterion. b, SynMap2 dot plot between sea lamprey scaffold 49 and scaffolds 10 and 27, with a 3-gene minimum per 10- gene window criterion. c, The inshore hagfish scaffold FYBX02010521.1, in which the putative VTR2 is located, is most syntenic with chromosomes of other species containing a VTR2A or VTR2B sequence, with a 1-gene minimum per 20-gene window criterion. d, Same synteny analyses as in c, but with a 2-gene minimum per 20-gene window criterion. e, The inshore hagfish scaffold FYBX02010841.1, in which the putative VTR1 is located, is most syntenic with chromosomes of other species containing a VTR1A or OTR sequence, with a 1-gene minimum per 20-gene window criterion. f, Same synteny analyses as in e, but with a 2-gene minimum per 20-gene window criterion.