The graph represents the yield of cells (number) with the CD34⁺lin⁻ phenotype obtained from 100 initial individual cells that have undergone one cell division based on the percent of cells that doubled and the percent of daughter cells that retained the CD34⁺lin⁻ phenotype (phenotypic self-renewal). Although the yields obtained with the combination of FLT-3L + TPO and SCF + TPO were not significantly different from each other, they were significantly different (P≤ .01) from all other cytokine combinations tested.