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. 2017 Aug 14;7:8091. doi: 10.1038/s41598-017-08547-0

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Effect of PT treatment on the apoptosis of PC9 and A549 cells (24 h). After treatment on both cell lines (A for PC9, B for A549), the apoptotic index of PT-treated groups exerted a dose-dependent increase in induction of apoptosis. The upper panel showed the cell nucleus (blue) and the lower panel displayed the apoptotic cells (green). All of the results were expressed as the mean ± SD; n = 6. ^aP < 0.05 vs. the control group, ^bP < 0.05 vs. the 20 μM PT-treated group, ^cP < 0.05 vs. the 40 μM PT-treated group.