Percentage of donor chimerism in granulocytes, mononuclear cells, and CD3⁺ in dogs treated with ²¹¹At–anti-CD45 mAb-conditioned nonmyeloablative DLA-identical bone marrow transplantation. Eight dogs received 155 to 625 μCi/kg ²¹¹At-labeled anti-CD45 mAb on day −3 followed by marrow grafts from a DLA-identical donor on day 0. The total anti-CD45 mAb dose was 0.5 mg/kg, whereof 10% was administered as unlabeled mAb 1 hour before the radioimmunoconjugate.