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. 2018 Jun 26;18:197. doi: 10.1186/s12906-018-2250-5

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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. 1 — a Cytotoxicity of OE determined by MTT assay. *P < 0.05: significantly different from control. b Morphology of RECs treated with several concentrations of OE for 24 h (arrow showing round and shrunken cells)