<unk>  is the use of<unk>  cells to treat or prevent a disease or condition. , the only established<unk>  using<unk>  cells is hematopoietic<unk>  cell transplantation. This usually takes the form of a bone-marrow transplantation, but the cells can also be derived from umbilical cord blood. Research is underway to develop various sources for<unk>  cells as well as to apply<unk> -cell treatments for neurodegenerative diseases and conditions such as diabetes and heart disease.<unk>  has become controversial following developments such as the ability of scientists to isolate and culture embryonic<unk>  cells, to create<unk>  cells using somatic cell nuclear transfer and their use of techniques to create induced pluripotent<unk>  cells. This controversy is often related to abortion politics and to human cloning. Additionally, efforts to market treatments based on transplant of stored umbilical cord blood have been controversial.
Stem-cell therapy
Syngeneic stem cell transplantation
Autologous stem-cell transplantation
Peripheral stem cell transplantation
Thymus transplantation
Hematopoietic stem cell transplantation
Autologous immune enhancement therapy
Spleen transplantation