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. 2018 Jun 25;11:176. doi: 10.1186/s13068-018-1174-0

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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. 2 — Effect of indigenous living bacteria on growth of Euglena gracilis in municipal wastewater (MW) effluent. Representative photograph of E. gracilis in MW1 effluent with living bacteria (A) and without living bacteria (B) after 7 days