Changes in cytokine levels in bronchoalveolar lavage (BAL) fluid after a single treatment with semi-SWCNTs (n = 4).

Note: BAL fluid was harvested at each time point and pooled (500 µL per mouse) to 4 test samples per group for further analysis. The level for each group was calculated in terms of mean±SD of the values measured. All treated groups except interleukin (IL)-12 had statistical significance of P<0.01 compared with the control group. TNF: tumor necrosis factor; IFN-γ: interferon-γ.