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. 2019 Jan 30;19:38. doi: 10.1186/s12862-018-1341-8

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 7 — Analysis of the evolutionary history of the nAChR family with chromosomal locations of the nAChR genes and their neighboring gene families in human, chicken and spotted gar. Crosses indicate gene loss or gene not yet identified. Chicken and spotted gar illustrations are re-used with permission from Daniel Ocampo Daza, source: www.egosumdaniel.se and the human image is re-used with permission from https://commons.wikimedia.org. The neighboring gene families and duplication schemes for the CHRNB1, CHRND and CHRNE/CHRNG genes. The spotted gar retained a local duplication of the CHRNB1 gene, forming CHRNB1.2. The right panel summarizes chromosomes included. This paralogon is referred to as paralogon 5 in this study