Fig. 2.

Effect of dispersion medium on neutrophil influx in BAL for CB 3, 5 and 28 days after pulmonary administration to mice. CB was administered intratracheally to mice at 162 µg/mouse. Three, five or twenty-eight days later BAL fluid was prepared and the number of neutrophils established by differential counting. Data are mean and bars represent SD. ***, ** and * designate P-values of <0.001, <0.01 and <0.05, respectively, of t-test in case of data approaching normality and not having a highly different variation (details given in the Methods section), otherwise of Mann–Whitney test.