Adoptive transfer of tolerance with splenocyte subpopulations. Survival times of syngeneic male skin grafts on B6 females injected intraperitoneally as neonates with 5 × 106 splenic cells from tolerant donors: either unseparated (n = 7; □), CD8 depleted (n = 4; ▵), CD4 depleted (n = 4; ⋄), or depleted of both cell subsets (n = 6; •).