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Pluripotent stem cells (iPS) developed from adult skin cells seem to be a good alternative to fetal stem cells, but they raise thorny ethical problems of their own. Research groups have already used iPS cells to produce mouse clones and also sperm and egg precursor cells. The latter could eventually be used to create new life from even dead tissue — not to mention allow parents to choose attributes such as eye and hair color. Of course, testing whether it works requires growing embryos — and disposing of them — which brings us back to the ethical dilemma. At the same time, stem cells promise treatment of conditions ranging from Parkinson's disease to Alzheimer's. How do we gain the benefits of the technology and still keep our humanity?
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