Cytokine levels in BALF following the 2^nd exposure to PM.

<p>A: IFN-γ. B: IL-5. C: IL-6. D: IL-13. E: IL-17A. F: TNF-α. The mice were exposed to 100 μL aliquots of solutions by intratracheal instillation on days 0 and 7 as described in the <i>Materials and Methods</i> section. PBS served as a vehicle control. The data are presented as the mean ± SEM (n = 5 per treatment group). *<i>p</i><0.05 compared to the PBS control group; ^#<i>p</i><0.05 compared to the other groups at the same dose.