Mobilization of neutrophils from the perfused femoral bone marrow in mice following the infusion of KC and G-CSF alone or in combination. The number of neutrophils (Gr-1^high) mobilized from the bone marrow after infusion of PBS, G-CSF (15 nM), KC (15 nM), or G-CSF and KC are shown. Results are expressed as means plus or minus SEM (n = 4 mice). *P < .05; **P < .01 (1-way ANOVA and Dunnett test).