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. 2016 Sep 20;16:367. doi: 10.1186/s12906-016-1351-2

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© The Author(s). 2016

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 — Viability of U87MG cells after treatment with EEP, HPE and their combination. Legend: Cytotoxicity effect of EEP (30 μg/mL), HPE (in concentrations 1.56–100.0 μg/mL) and their combinations after 24 (a), 48 (b) and 72 (c) hours of incubation. The results are presented as a percentage of control. All statistical analyses were performed using Student-t test (p < 0.02): ^*HPE vs HPE with EEP; ^#EEP vs HPE with EEP; ● HPE 24 h vs HPE 48 h; ○ HPE 48 h vs HPE 72 h; ■ HPE with EEP 24 h vs HPE with EEP 48 h; □ HPE with EEP 48 h vs HPE with EEP 72 h