Recruitment of single CD34⁺CD38⁺ and CD34⁺CD38⁻ cells into cell division when cultured with either IL-3 + IL-6 + G-CSF + SCF (4 HGF ) or 4 HGF + FLT3L. Cells were deposited into wells of a Terasaki plate each containing 10 μL of serum-free pre-CFU media. Wells containing a single cell were examined at 3, 7, and 14 days to determine the proportion of single cells undergoing division. The results are the means and standard error of three experiments performed with different sources of adult human BM.