Reconstitution of peripheral blood lymphocytes. Reconstitution of peripheral blood lymphocytes in unconditioned (A) versus 3Gy-conditioned (B) Rag2° recipients. Mice were reconstituted with 10⁴ Sca1⁺ BM cells and peripheral blood cells analyzed at 8 weeks after transfer and then monthly up to 6 months. Five mice per group were analyzed. In A and B, ▪ indicates CD3/CD4; ▨, CD3/CD8; and □, B220/IgM. Data are expressed as means ± standard deviation.