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. 2018 Jan 27;9:2. doi: 10.1186/s13227-018-0091-4

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© The Author(s) 2018

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. 1 — ETCHbox genes in human and mouse. The ETCHbox group of homeobox genes has six members: Leutx, Tprx1, Tprx2, Dprx, Argfx and Pargfx. In human, Pargfx has been lost in evolution. In mouse, only Tprx1 and Tprx2 orthologues remain and are referred to as Crxos and Obox, respectively; each has undergone sequence divergence and gene duplication