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. 2021 Jul 23;12:4489. doi: 10.1038/s41467-021-24573-z

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© The Author(s) 2021, corrected publication 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. 3 — a Japanese lamprey scaffolds are illustrated with the scaffold IDs. These scaffolds were partitioned into segments of conserved synteny, and segments corresponding to proto-vertebrate chromosome Pvc3 (blue) and Pvc17 (green) are shown for illustrative purposes. b Groups of segments of the same colour were organized into several subgroups representing proto-cyclostome chromosomes based on the distribution of paralogues and orthologues. c The triangular plot is a 45°-rotated graph of the paralogue distribution between the 12 proto-cyclostome chromosomes that correspond to Pvc3 and Pvc17. This shows large numbers of paralogues between the chromosomes (dots in the red regions) but few paralogues within each chromosome (dots in the yellow regions). d The table classifies the proto-vertebrate chromosomes with respect to the number of duplicated proto-cyclostome chromosomes as shown in the ‘Multiplicity' column (Pvc18 was retained as a single proto-cyclostome chromosome because Pvc18 had too many segments for the reconstruction algorithm). The table also shows the numbers and ratios of Japanese lamprey genes that were mapped to the proto-cyclostome chromosomes originating from the proto-vertebrate chromosomes shown in the ‘Chromosomes' column.