neo+ donor cell landing in various brain (A), lung (B), liver (C), and spleen (D) after transplantation. Fresh marrow mononuclear cells, EMC, or EMC fractionated into ER-MP20+, ER-MP12+, and ER-MP20−12+ subpopulations were transplanted into B6/129F2 mice. Organs were removed at various time points, and genomic DNA was extracted and studied for the presence of neo+ cells by using a semiquantitative PCR. Data are presented as the average percentage of neo+ cells per tissue sample (y axis).