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. 2020 Oct 1;95(1):53–65. doi: 10.1007/s00204-020-02923-y

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Chemotaxis (migrated cells) of the dHL-60 cells in response to supernatants of NR8383 cells challenged with micro- and nano-sized ZnO particles. Results represent arithmetic means and standard deviations of three independent experiments. Commercially available silica nanoparticles served as positive control