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Figure 2 IL8 protein release from A549 cells, after 24 h treatment with (A) fine particles or (B) nanoparticles at 15, 31, 63, 125 and 250 µg/ml, or (C) DQ12 quartz at 48, 96, 192 and 384 µg/ml. Means and standard errors of 4 experiments. Significant difference from control: *p<0.05, **p<0.01, ***p<0.001.
