<qa>  What is the only difference between the recipient and donor?The reason for doing the study is to determine if the stem cells and other white blood cells collected are any different when different growth factors are given, and to see how well the patient does. The stem cell transplant will in every other way be the same. The only difference is that if the recipient and donor decide to be in this study, the donor will either be given only G-CSF or the combination of G-CSF and GM-CSF and the recipient will receive the stem cells collected. 