Abstract
C57BL mouse spleen cells incubated with (C57BL x 101) F/sub 1/ liver homogenate killed only 17% of sublethally irradiated (C57BL x 1O1)F/sub 1/ recipients, whereas when incubated with C57BL liver homogenate or injected without incubation such cells killed 100% of sublethally irradiated (C57BL x 1O1)F/sub 1/ recipients within 35 days. Although the immunologically inactivated spleen cells showed a decreased ability to kill, circulating donor-type erythrocytes were found in surviving recipients, indicating repopulation of the bone marrow by surviving graft-derived stem cells. From this, it is inferred that immunologic inactivation did not result from nonspecific destruction of all types of implanted cells.
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