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. 2017 Oct 19;7:13593. doi: 10.1038/s41598-017-12706-8

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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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Distribution of otter anal gland samples across four genetically distinct subpopulations in England and Wales. Pink = Wales and Borders (W&B), Red = South-west England (SW), blue = North England (NE), Green = Central England (CE). Samples outside the four subpopulations were excluded from the present analysis. Map created using ArcGIS® software ArcMap™ 10.1 Copyright © Esri www.esri.com. Outline of genetically distinct subpopulations created using data from Hobbs et al.²⁷.