Percentage of donor nucleated cells in the blood of individual recipient mice 4 and 6 months after transplantation.

Mice had transplantation with CD34⁺ mononuclear marrow cells of normal adult mice that were further separated on the basis of CD38 expression. Because the ratio of CD34⁺CD38⁻ (R19) cells to CD34⁺CD38⁺ (R20) cells was 27:5 according to Figure 10, 1.0 × 10⁵CD34⁺CD38⁻ cells or 1.8× 10⁴CD34⁺CD38⁺ cells were injected into individual mice. Results are shown at 4 months (○) and 6 months (●). The difference between the groups (6-month engraftment) is significant at P < .05. Results shown are representative of 2 experiments.