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Effect of MNPs on Neuro-2a cell division. Neuro-2a cells were exposed to a wide range of MNP concentrations for 24 h. The effect of the exposure was measured by taking images of cell nuclei every 2 h. Cell quantification results were normalized for each experimental condition, taking as a reference the number of cells counted for each condition at the beginning of the experiment (t = 0). Histograms represent mean ± s.e.m. values.
