Percentage of cells with the +8 chromosome aberration in CD34⁺ subpopulations. The CD34⁺7⁺ (T/NK-progenitor cells), CD34⁺19⁺ (B-progenitor cells), and CD34⁺Thy-1⁺ (pluripotent-stem cells) of all patients showed an intact chromosome 8. Trisomy 8 was observed at a high frequency among CD34⁺33⁺ (CFU-GEMM) subpopulation cells.