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. 2017 Nov 3;12(2):424–437. doi: 10.1038/ismej.2017.175

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Copyright © 2018 The Author(s)

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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principal component analysis of the tetranucleotide frequencies in S. ruber strains and their isolated and environmental viruses as well as S. ruber and Hqr. walsbyi strains and environmental viruses. The viruses isolated in this work are colored in increasing shades of red, according to their GC content.