Engraftment of T-cell–depleted BALB/c marrow in mice treated with 100 μg 30F11 antibody labeled with 0.5 to 1.5 mCi¹³¹I alone (A) or combined with 4 Gy TBI (B). Proportion of T cells of donor origin (mean ± SD) 3 months after transplantation. Data point labels indicate the number of mice with ≥80% donor T cells of total surviving mice (of 6 treated mice per group).