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. 2020 Nov 17;37(4):573–593. doi: 10.1007/s10565-020-09571-z

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© The Author(s) 2020, corrected publication 2020

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Fig. 12 — Chemotaxis (migrated cells) of unexposed dHL-60 cells in response to NR8383 cell supernatants that were obtained by incubation with increasing concentrations of ZnO particles (top) and zinc acetate (bottom). Data are expressed as mean ± SD (N = 3). Commercially available silica nanoparticles served as positive control. All concentrations refer to solid ZnO or silica material, except for zinc acetate where the concentration of Zn²⁺ is given