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. 2023 Nov 20;24:693. doi: 10.1186/s12864-023-09779-3

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 2 — Discrepancies amongst reference genomes for (A-C) Delphinapterus leucas (beluga) and (D) Monodon monoceros (narwhal). The light and dark blue inside ring depicts the reference scaffolding structure (Dl₅ for beluga, Mm₃ for narwhal); alternating light and dark indicates a break in the super scaffolds making up chromosomes. Here, debris depicts small segments of DNA assembled in the query, but not in the reference. Translocations refer to segments of the query mapping to different reference chromosomes. Inversions refer to segments of the query mapping in a direction opposite to the dominant mapping direction for a given reference super scaffold. Relocations refer to segments of the query that appear out of order compared to the reference (see Table 1 for more definitions)