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. 2018 Jun 14;9:15. doi: 10.1186/s13227-018-0103-4

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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. 2 — Correlation between QA ratio of the transcription factor Runx2 and facial length in order Carnivora. The Siberian husky, a breed of the domestic dog (Canis lupus familiaris), has 20 glutamine- and 8 alanine-coding nucleotide sequences within the repetitive glutamine and alanine domain of Runx2. QA ratio, calculated by dividing total glutamine-coding sequences by total alanine-coding sequences, is 2.50 and results in a longer face. The domestic cat (Falis catus) has 21 glutamine- and 10 alanine-coding nucleotide sequences within the corresponding domain of Runx2. QA ratio is 2.10 and results in a shorter face