Banking your own cells means that you won’t have to worry about the adverse immune reactions that could come with using donor cells in the future. Our bodies can have serious reactions to foreign tissues where our immune system rejects the transplanted organ or tissue, leading to complications and dangerous conditions. Immunosuppressant drugs, which are taken by individuals post donor transplant to prevent the rejection of donor cells, can have side effects such as reduced immune system response in addition to increased risk of infection, high blood pressure, and kidney damage.