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ENGRAFTMENT FOLLOWING T‐CELL-DEPLETED BONE MARROW TRANSPLANTATION II. STABILITY OF MIXED CHIMERISM IN SEMIALLOGENEIC RECIPIENTS AFTER TOTAL‐BODY IRRADIATION

Chronic, stable mixed chimerism of both lymphocytes and erythrocytes was observed in semiallogeneic murine recipients of T-cell-depleted bone marrow transplants that had been conditioned with supralethal total-body irradiation (1100 cGy). Mixed chimerism was extensive, with a wide range of donor engraftment persisting for at least one year after transplant. In both erythrocyte and lymphocyte lineages, decreasing donor engraftment correlated with decreasing marrow dose; however, complete red cell engraftment was more easily achieved than complete lymphocyte engraftment. There were no late graft failures, even among animals exhibiting a substantial host component of hematopoiesis. The extent of mixed hematopoietic chimerism therefore appears to be much greater than had been expected in recipients of T-cell-depleted bone marrow transplants.