 NAMASKARA Nannisru Dr. Mallika Arjun Kalishti I am a consultant hematologist hemato oncologist and bone marrow transplant physician at Manipal Hospital, Bangalore So stem cells are usually bone marrow So conventionally and historically the stem cells are collected from bone marrow but now majority of the transplant is not done in adults they are injected with granulocyte stimulating factor so majority of the times when we do transplantation in adults we collect stem cells from the peripheral blood one of the aphorosis process so aphorosis procedure a patient in a blood one of the machine stem cells are only separated and the type of the blood component will return it so most of adult stem cell transplantations stem cells are collected from peripheral blood in childhood disease like thalassemia aplastic anemia we will collect stem cells from the bone marrow so donor who is there after operation we collect stem cells from the bone marrow so stem cells can be collected from the blood itself through aphorosis procedure we can also collect stem cells from the bone marrow of the donor