When Robert Sackstein was a bone-marrow-transplant surgeon in the 1980s, henoticed that fewer than 5 percent of the transplanted blood stem cells reachedtheir target in a patient's marrow.

1980年，骨髓移植手术的外科医生Robert Sackstein注意到少于5%的被移植的血干细胞能达到病人的骨髓靶细胞，于是他决定研究细胞是怎样移动的，跟随的是什么指示。

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Placental blood donations differ from bone marrow donations, in that stem cells can be transplanted without the need to find a match. Thus more patients with leukemia and other diseases can be saved.

捐赠脐带血和捐赠骨髓不一样，移植干细胞不需要寻找配对，所以有更多白血病和其他疾病的患者可以获救。

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Once these transplanted donor cells get settled within the patient's bone marrow, they make the healthy red blood cells, white blood cells and platelets necessary to support life.

这些被移入的细胞一旦进入患者的骨髓被吸收后，就可制造出生命必需的健康的红细胞、白细胞和血小板。

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The scientists transplanted pig bone marrow cells into the mice.

BBC: NEWS | Health | Pig organs may be safe for humans

The transplanted bone marrow contains stem cells that can turn into skin cells.

CNN: A mother's plea: Heal my children's skin

Another possibility is a bone marrow transplant - the existing bone marrow cells are destroyed using chemotherapy, then new, healthy ones are transplanted in to take over their job.

BBC: Q&A: Test-tube lifesaver