Neutrophil accumulation into the BALF of G-CSFR^−/− mice is reduced following P aeruginosa infection. (A) Kinetics of neutrophil accumulation into the BALF of wild-type and G-CSFR^−/− mice following P aeruginosa infection (n = 3-13, each time point). (B) To correct for the effect of circulating neutrophil number on neutrophil recruitment to the lungs, the number of neutrophils in the BALF of each mouse was divided by the total number of neutrophils present in the blood. All data represent the mean ± SEM. ‡P < .05 compared with untreated mice of the same genotype. *P < .05 compared with G-CSFR^−/− mice.