Fig. 3

Surface PAHs increased epithelial toxicity of CBNP in the ex vivo murine tracheal model. The diagrams show the quantification of apoptotic (a) and necrotic (b) epithelial cell numbers. Data represent the total number of necrotic and apoptotic cells counted in whole mount preparation after 24 h exposure to CBNP compared to medium controls. All data are mean ± SEM. n = 5–11, *p < 0.05 and **p < 0.01, CBNP compared to medium controls analyzed by Wilcoxon signed-rank test