Percentages of donor (▪) (H-2^d)- and host (□) (H-2^b)-derived cells in peripheral blood of mixed chimeras measured 4 months after conditioning by two-color FACS analysis. B10 hosts were treated with anti-T–cell MoAbs, 6 Gy TBI and a mixture of 5.10⁶ syngeneic and 15.10⁶ fully mismatched allogeneic (B10.D2) donor bone marrow cells.