Multilineage human hematopoietic engraftment in NOD/SCID mice that received a transplant of limited numbers of CD34⁺BB9⁺ cells. Representative examples from the experiment shown in Figure 4 showing myeloid (CD33) and B-lymphoid (CD19) engraftment in individual NOD/SCID recipients of 10⁴ (A) and 2 × 10⁴ (B) CD34⁺BB9⁺ cells. The percentages indicate the proportion of hCD45⁺ cells expressing the particular lineage marker. (C) Examples of 3 mice that received a transplant of 10³, 5 × 10³, and 2 × 10⁴ CD34⁺BB9⁺ cells, demonstrating by means of 2-color analysis the significant proportion of hCD45⁺ cells within the bone marrow represented by CD34-expressing cells.