LTHC-IC frequencies of ex vivo–expanded CD34⁺ cells isolated in different phases of the cell cycle. CD34⁺ cell subsets were sorted as described in Fig 7. LTHC-IC frequencies are given per 100 cells of each phenotype indicated. Paired data from four BM samples are reported as the mean ± SEM. Statistical analysis was made by ANOVA followed by SNK pairwise comparisons. *P < .05 v G₀ , G₁ , and S/G₂ + M CD34⁺ PKH2^dim cells; **P < .05 v G₁ and S/G₂ + M CD34⁺PKH2^dim cells.