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. 2017 Jul 5;7:4636. doi: 10.1038/s41598-017-04098-6

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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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Redox active CNPs protect cells from hydrogen peroxide and UVB. (a) ROS levels increment measured by DHR fluorescent signal detected by flow cytometry 1 h after cell treatment with H₂O₂ ± CNPs. (b) % of apoptosis detected 24 h after cell treatment with H₂O₂ ± CNPs. (c) % of apoptosis detected 24 h after cell treatment with UVB ± CNPs. Values are the mean of ≥3 independent experiments ± SD; *p < 0.05 (ANOVA). Significance with respect to the control group is shown. In (b) and (c) also the significance with respect to the C3 group is shown, ^#p < 0.05 (ANOVA).