Induction of donor type chimerism after transplantation of C57BL/6 Sca-1⁺Lin⁻ cells into lethally (10 Gy TBI) or sublethally (7 Gy TBI) irradiated C3H/HeJ recipients. The number of Sca-1⁺Lin⁻ cells infused was calculated based on FACS analysis.