1.   The transplanted marrow may reject the body and vice versa, the marrow may die off without taking hold, or infection may overwhelm the patient.

2.   Then, by simply counting nodules, they were able to estimate the number of progenitor cells in each batch of transplanted marrow.

3.   These are cells that Dr. Ildstad says she has isolated from the bone marrow of humans and animals that enable transplanted marrow to take up residence and proliferate.

4.   Ildstad said her work in lab animals suggests that the transplanted marrow will permanently take up residence in its new host and go on producing blood cells indefinitely.

5.   The risk of dying from a recurrence of the cancer, infection, rejection of the transplanted marrow or other causes is highest during this period.

6.   Though their exact purpose is unknown, they seem to prevent the body from destroying transplanted marrow.