Phenotypic analysis of BM cells derived from a NOD/SCID mouse transplanted 20 weeks previously with the infected progeny of 3.5 × 10⁴ FACS-purified CD34⁺ human CB cells. In (A), the cells were stained with irrelevant isotype-matched mouse IgG labelled with FITC and PE and the gates shown set to exclude 99.9% of these cells. In (B), the cells were stained with a combination of anti–CD45/71-FITC and anti–CD19-PE. In (C), the cells were stained with anti–CD34-PE.