By John Gearhart

It is rare that a field of scientific research can simultaneously represent a domain of fundamental discovery in human biology and potentially have major effects on human health and the quality of life. Human embryonic stem cells serve not only as a resource for basic research, but also as the starting material for the development of cell-based therapies. Formidable scientific challenges face those who aim to develop cell-based therapies. It will take the efforts of many scientists and clinicians in a variety of disciplines to bring this endeavor to fruition. Of immediate
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