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. 2020 Dec 11;20:164. doi: 10.1186/s12862-020-01726-0

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© The Author(s) 2020

Open AccessThis 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. 1 — Possible changes of exon–intron boundaries over equal (a, b) and non-equal (c) distances found in genome pairwise alignments. a Intron sliding in SSPO homologous genes (Ensembl transcript ids human ENST00000378016, mouse ENSMUST00000169350, rat ENSRNOT00000035906, dog ENSCAFT00000007296, cat ENSFCAT00000024510, cow NM_174706, pig ENSSSCT00000045656; human* is an alternative SSPO transcript ENST00000475488 with unslided intron); b intron sliding in IGSF5 gene (human ENST00000380588, green monkey ENSCSAT00000006363.1); c intron border shifting over non-equal distances in DEFB133/Defb49 genes (human ENST00000398721, rat ENSRNOT00000060805)