HPC mobilization by G-CSF in NE × CG-deficient and DPP-I–deficient mice. Wild-type and NE × CG-deficient mice (A) or wild-type and DPP-I–deficient mice (B) were treated with 250 μg/kg G-CSF per day for 5 days, and the number of CFU-Cs in the bone marrow, blood, and spleen was quantified 4 hours after the final dose of G-CSF (n = 4 mice each group). Data represent the mean ± SD.