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. 2022 Jun 16;22:233. doi: 10.1186/s12890-022-02021-y

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© The Author(s) 2022

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/. 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 in a credit line to the data.

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Fig. 3 — Chemotaxis (migrated cells) of the unexposed dHL-60 cells in response to NR8383 cell supernatants obtained from incubations with increasing compound concentrations. For comparison data of the ZnO, induced chemotaxis are shown. Commercially available silica (SiO₂) nanoparticles were used as positive control that allows comparison with historical data. Results represent fitted dose–response models for the numbers of in vitro migrated cells after treatment with ZnO and BaSO₄. Results represent arithmetic means and standard deviations of three independent experiments