What do we know about the ability of adult stem cells to repair tissues?
Some research studies show rare events by some adult stem cells to repair tissue. Tissue repair by hematopoietic stem cells is controversial, due to questions of cell fusion. However, hematopoietic stem cells have been successfully used in bone marrow transplants to repopulate the immune and blood systems. Research is ongoing to determine if adult stem cells can help repair the damaged heart and brain, among other tissues.