mRNA and protein expression levels of inflammatory cytokines. Quantification of mRNA expression levels of TNF (panel a and c) and CXCL-2 (panel b and d) in RAW 264.7 macrophages exposed to 0.1-50 μg/mL of S- and L-CNT for 6 (panel a and b) or 24 (panel c and d) hours. Quantification of protein expression levels for TNF-α (panel e and g) and CXCL-2 (panel f and h) in RAW 264.7 macrophages exposed to 0.1-50 μg/mL of S- and L-CNT for 6 (panel e and f) or 24 (panel g and h) hours. *: p<0.05 versus control condition. C: Control (unexposed) cells. S-CNT: short CNT. L-CNT: long CNT.