Cell proliferation in the lungs of male AKR mice at 21 days after exposure to V
in the absence or presence of RSV pre- or post-exposure. Bromodeoxyuridine (BrdU)-positive cells were quantified in (A) lung parenchyma and (B) airways as described in Methods. Data were analyzed by One-way ANOVA followed by Tukey's multiple comparison test. *P < 0.05 compared to Control.