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. 2018 Jul 13;8:10595. doi: 10.1038/s41598-018-29019-z

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© The Author(s) 2018

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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Cytotoxicity of ZGO. (a–c) MTT assay of the A549 cell line, HUVEC cell line, and HepG2 cell line under different concentrations, and (d) MTT assay of the three cell lines with ZGO or pre irradiated ZGO. The cells were incubated with ZGO or pre-irradiated ZGO for 24 h. Data represent the mean ± SD (n = 6). Pre-irradiated ZGO means that the ZGO was pre-irradiated with a 254 nm UV lamp for 5 min before experiment.