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Internal concentrations of Al2O3-NP over various exposure concentrations as obtained by digestion combined with nebulization-ICP-MS measurements after 24 h of exposure. Results are presented for each particle type and cell line in one diagram. Data are shown as mean ± standard deviation of at least three independent replicates. Significant differences between the cell lines were tested with two-way ANOVA (*p < 0.05, **p < 0.01)
