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. 2018 Jan 9;11:4. doi: 10.1186/s13068-017-1005-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 6 — Principal component analysis based on the proportion of sequence numbers. a Total microbiomes. b Bacteria. c Archaea. The samples from day 0, 10, 20, 34, 44, 56, 74 represent the inoculum, phase I, II, III, IV, V and VI, respectively, the samples from day 100, 130 and 155 represent phase VII