Stem cell transplantation is a quickly developing area of research with the goal of replacing, regenerating, or reinvigorating injured tissues. Allogeneic stem cells are often rejected by the immune system of the transplant recipient, drastically reducing their potential positive therapeutic effects. Upon the advent of induced pluripotent stem cells (iPS cells), the possibility of creating patient-specific stem cell lines gave hope for a reduced risk of rejection. It is apparent, however, that large-scale generation of patient-specific iPS cells is not
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