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Cell viability (A), ROS generation (B), LDH release (D) and concentration of IL-8 (D) after exposure to 15% Ag-SiO2 and CuO ENMs in monoculture (A549) and co-culture model. The data were presented as mean ± S.D. * indicates P < 0.05; ** indicates P < 0.01; *** indicates P < 0.001.
