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. 2019 Dec 12;20:977. doi: 10.1186/s12864-019-6290-0

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© The Author(s). 2019

Open Access This 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. 3 — Expansion of the OR gene in mammals. a and b NJ phylogenetic trees constructed from all intact OR genes in OGG2–1 and OGG2–2, respectively. c and d Number of gene amplifications and losses in the OGGs of (a) and (b) in different branches and nodes, respectively