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. 2017 Dec 4;17:518. doi: 10.1186/s12906-017-2009-4

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© The Author(s). 2017

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. 4 — Cytotoxicity of Osmunda regalis ethanolic extract in increasing concentrations on HNSCC cell lines HLaC78 and FADU, and HLaC79/HLaC79-Taxdetermined by MTT assay. Calculated EC50 Doses were 0.85µg/ml or 2.14 µg/ml for FADU or HLaC78 and 0.99 or 2.14 µgl/ml for HLaC79 and HLaC79-Tax, respectively, after 48 h incubation