Sometimes, the donor's bone marrow does not grow. Then, the patient would be without working bone marrow cells. So that we will be ready to treat this problem if it happens, we will take bone marrow from the hip bone before the patient gets the drug treatment. The patient will be asleep (sedated) when the marrow is taken, and they will be given medicine for any pain they have afterwards. This bone marrow will be frozen and stored or preserved. If the donor bone marrow does not grow, we will thaw the stored marrow and put it back into the body. This stored bone marrow should grow and produce working blood cells. If the stored bone marrow must be given back, the disease will not be cured.