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. 2017 Feb 23;36:35. doi: 10.1186/s13046-017-0502-8

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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. 2 — Assessment of apoptosis by MTT assay. a The inhibition ratio of HeLa cells after treated with cinchonine for 48, 72, and 96 h. b and c represented A549 and NHDF cells. Quantitative analysis of MTT represented as the mean ± SD of three independent experiments. *P < 0.05 and **P < 0.01 when compared to untreated control