Multilineage reconstitution by α4⁺ competitor cells. Expression of α4⁺ cells (▪) among cells from different lineages in (A) BM, (B) lymph nodes (LN), and (C) thymus of mice transplanted with 3:1 (test:competitive) cell ratio and tested at 36 weeks after transplantation. ( show the proportion of α4^- cells.) Proportions of α4⁺ cells (▪) in all tested tissues after transplantation show only minor deviations from data in normal, nontransplanted tissues (ie, normal BM has 95%-99% α4⁺ cells), suggesting multilineage engraftment.