Hematopoietic reconstitution by cells cultured with TPO alone. Nucleated cells of peripheral blood were analyzed by flow cytometry 5 months after transplantation. Thy-1.2⁺ cells, B220⁺ cells, and Gr-1⁺Mac-1⁺cells of donor (Ly-5.1) origin are seen. The analyses of additional samples are presented in Table 4.