Induction of long-term donor-specific skin graft survival by pretransplantation infusion of donor splenocytes. 2C_F1transgenic mice were injected IV with splenocytes from L^d-syngeneic mice (top, n = 14) or L^d+ mice (bottom, n = 15). Eighteen days after injection, each mouse was given skin grafts from SJL (▴), BYJ (•) and (B6×dm2)_F1 (▪). The grafts were monitored and scored after skin transplantation for more than 120 days.