Distribution of total cells produced (A) and total CD34⁺ cells (B) produced by fetal liver (FL, □) and cord blood cells (CB, ▪) according to their proliferation history (0 to >6 divisions) during 5 days of suspension culture in the presence of IL-3, IL-6, SF, G-CSF, and FL. Values shown are the mean ± SEM from 5 (FL) and 6 (CB) experiments. Note change of scale on the ordinate axis: the lefthand side indicates the scale for cells that underwent ≤3 divisions, the righthand side indicates the scale for cells that underwent ≥4 divisions.