BM homing of purified ALDH^hiCD133⁺Lin^- or ALDHhiCD133^-Lin^- cells 48 hours after transplantation. Representative flow cytometric analysis of NOD/SCID β2M-null mice that received transplants of 2 × 10⁵ purified (A-C) ALDH^hiCD133^-Lin^- or (D-F) ALDHhiCD133⁺Lin^- cells. At 48 hours after transplantation, human hematopoietic cells were detected in the murine BM by coexpression of CD45 (R1) and HLA A, B, and C (R2).