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. 2018 Oct 26;8:15877. doi: 10.1038/s41598-018-34207-y

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© The Author(s) 2018

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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Geographical distribution on Italian territory of three main gene pools we identified via GBS-derived SNP markers in the olive germplasm collection under study. The blue circles (I₁) encloses all the Italiote cultivars with admixed ancestry. Inside the yellow circle (I₂) all the cultivars with Catalan origin are placed. Finally, inside the green circle (I₃) are most of the cultivars of Magno-Greek origin split into varieties from Ionic (dark green stars) and Doric (light green stars) area of influence.