Ratio of human hematopoietic lineage to total human cells recovered from long-term engrafted mice. Bone marrow recovered from each bnx/hu mouse was subjected to antibody labeling followed by FACS analysis to determine the percentage of engrafted human hematopoietic cells of each lineage. The averages of each cell type recovered from all mice that received human cells cultured with the same transduction conditions before transplantation are shown.