Fig. 2From: In vitro-in vivo correlations of pulmonary inflammogenicity and genotoxicity of MWCNTFold increase of IL-8 mRNA levels (Cxcl8) in A549. Cells were exposed to NM for 6 or 24 h. IL-8 mRNA levels were normalized to 18S and then to vehicle control. The values are mean ± SEM of minimum three independent experiments. *: p≤0.05, **: p≤0.01, ***: p≤0.001Back to article page