|Editor's Note: This is the first of two articles on questions raised by recent stem cell discoveries. The second article, focusing on various organs and the nervous system, will appear in the Nov. 27 issue of The Scientist.|
As long-held notions about biological development are challenged,2 the therapeutic and ethical implications of stem cell work are also generating controversy. Scientific and "cultural" debates promise to sharpen further once reviewers, under National Institutes of Health guidelines issued in September,3...
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