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. 2017 Aug 4;8:201. doi: 10.1038/s41467-017-00110-9

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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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Origin of the prokaryotic sequences. The pie charts represent the estimated proportion contributed by marine (blue), terrestrial (brown) and unknown (white) sources for the 99 sampled locations over the Pacific a, Atlantic b and Indian c oceans where we could get sequence information. Please note that the different panels have different scales. Data available in Supplementary Table 2