Detection and reemergence of the losing unit in 13 patients with single-donor dominance in whole BM in PBMCs and in CD3, CD33, and CD56 cell subsets at days 28, 80, and 365 posttransplant. BMA, bone marrow aspiration; Mc−, negative microchimerism; Mc+, positive microchimerism; Non-eval, not evaluable.