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. 2018 Feb;28(2):256–265. doi: 10.1101/gr.206938.116

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© 2018 Lowe et al.; Published by Cold Spring Harbor Laboratory Press

This article is distributed exclusively by Cold Spring Harbor Laboratory Press for the first six months after the full-issue publication date (see http://genome.cshlp.org/site/misc/terms.xhtml). After six months, it is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.

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Figure 1. — The collection locations of the 11 freshwater stickleback (blue) and 10 marine stickleback (red). Of the 21 sites, 14 belong to marine–freshwater pairs in which the sampling sites are geographically adjacent and have likely experienced ongoing or historical gene flow. Such gene flow reduces the number of genetic differences that are not related to differing marine and freshwater habitats.