Percentage of donor nucleated cells in the blood of individual mice having transplantation with 400 Lin⁻c-kit⁺Sca-1⁺CD38⁻or 200 Lin⁻c-kit⁺Sca-1⁺CD38⁺marrow cells of 5-FU–treated mice 6 months before.

The numbers of transplanted CD38⁻ and CD38⁺cells reflect the 2:1 ratio of the cells in R5 and R6 windows of Figure1. The difference between the groups is significant atP < .001. Results shown are representative of 2 experiments.