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. 2017 May 24;7:2330. doi: 10.1038/s41598-017-02314-x

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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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Phylogenetic tree showing the distribution of PKS sequences from Firmicutes. ACP DNA sequences were clustered at 85% sequence identity and subsequent representative sequences from OTUs were aligned in ClustalW and neighbor-joining tree was displayed in iTOL2. Branches of reference sequences were colored bright red, rhizosphere soil sequences were colored by site (P1, P2 and P3), and outer ring was colored according to plant growth stage (emergence and senescence).