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. 2017 Jul 14;7:5459. doi: 10.1038/s41598-017-05764-5

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© The Author(s) 2017

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Upper first molar morphology mapped on genealogy of dog sample (see Fig. 2). Same symbols as in Fig. 2. The undeveloped molars of MAM 1501 and 2419 are not shown. A molar of a coated dog with normal cusp morphology is presented for comparison (top right).