骨髓干细胞仅占全部骨髓细胞的1/1000到1/10000。美国斯坦福大学的研究者们已能分离出小鼠的骨髓干细胞。用80-100个这种细胞可使经大剂量照射骨髓的小鼠重建造血,有的动物仅需30个细胞。用标记方法表明新生的血细胞并非来自照射后残存的细胞,其证明了分离和纯化是成功的。西雅图市的Fred Huchinson癌症中心的科学家们使用约 Bone marrow stem cells account for only 1/1000 to 1/10000 of all myeloid cells. Researchers at Stanford University in the United States have been able to isolate mouse bone marrow stem cells. With 80-100 of these cells, mice that have been exposed to high doses of bone marrow can reconstruct blood, and in some animals only 30 cells are needed. Marked methods indicate that neonatal blood cells do not come from cells that remain after irradiation, demonstrating that the isolation and purification were successful. Scientists at the Fred Huchinson Cancer Center in Seattle use about