Changes in white blood cells (- -) and in circulating clonogenic progenitors (CFU-C/mL blood) in four treated nonhuman primates. Animal A was given G-CSF (30 μg/kg/d for 5 days) and animal B was given G-CSF (30 μg/kg/d for 5 days) followed by a humanized anti-VLA4 antibody (1 mg/kg/d for 2 days). Animals C and D were given only the humanized anti-VLA4 (1 mg/kg/d for 3 days) BFUe (▪) and nonerythroid () colonies.