FACS dot plots showing the frequencies of human CD45/71⁺ (total) and human CD34⁺(primitive) hematopoietic cells (left panels) and the frequencies of human CD19⁺ (B-lymphoid) and CD15⁺(granulopoietic) cells (right panels) in the most-highly engrafted secondary mice injected with equivalent transplants of cells obtained from primary mice engrafted with human cord blood cells and administered a 2-week course of SF, IL-3, GM-CSF, and Ep (Mouse 2) or not (Mouse 5) in a representative experiment.