Reconstitution kinetics with CD150high, CD150med, and CD150neg CD34−KSL cells. Each of a group of lethally irradiated mice received 10 CD150high cells, 10 CD150med cells, or 10 CD150negCD34−KSL cells. (left) The change in the percentage of chimerism over time. Blood of recipient mice was analyzed 2, 3, 4, and 5 mo after transplantation. Each line shows a change in the percentage of chimerism from one recipient mouse. (right) The relative myeloid, B lymphoid, and T lymphoid lineage contributions in reconstituted donor-derived blood cells of individual recipient mice 4 mo after transplantation. Myeloid lineage represents 53.7 ± 27.2% (n = 19), 22 ± 21.8% (n = 19), and 13 ± 21.7% (n = 14; mean ± SD) after transplantation with CD150high, CD150med, and CD150negCD34−KSL cells, respectively. B lymphoid lineage represents 38.2 ± 21.5% (n = 19), 56.2 ± 17.9% (n = 19), and 60.7 ± 21.5% (n = 14; mean ± SD) after transplantation with CD150high, CD150med, and CD150negCD34−KSL cells, respectively. T lymphoid lineage represents 8 ± 8.4% (n = 19), 21.8 ± 9.4% (n = 19), and 26.3 ± 19.4% (n = 14; mean ± SD) after transplantation with CD150high, CD150med, and CD150negCD34−KSL cells, respectively. The proportion of myeloid lineage reconstitution by CD150highCD34−KSL cells was significantly greater than that of CD150negCD34−KSL cells (P < 0.0001).