Lymphoid and myeloid repopulating ability of SDF-1/PBSF mutant fetal liver cells. Shown is flow cytometric analysis of bone marrow (a and b), spleen (c), or thymus (d) from C57BL/6-Ly5.1 radiation chimeras transferred with wild-type (open columns) or SDF-1/PBSF−/− (solid columns) fetal liver cells 12 weeks after transplantation. (a) Bone marrow cells stained with anti-B220 and anti-Ly5.2. (b) Quantification of numbers of donor-derived B220+ B cells, Mac-1+ granulocytic-monocytic cells, Gr-1+ granulocytic cells, and CD61+ megakaryocytic cells found in two femurs. (c) Quantification of numbers of donor- derived B220+ B cells. (d) Quantification of numbers of donor-derived CD4+ T cells.