Ly-5.1 cells are underrepresented in all hematopoietic organs of B6 recipients. (A) In Ly-5–positive cells, the percentage of Ly-5.1 cells (mean ± SD) was significantly lower than the percentage of Ly-5.2 cells (mean ± SD) in the peripheral blood (P = .001), spleen (P = .007), and bone marrow (P = .002) of B6 mice 30 weeks after transplant.