NIH on Friday proposed a small change to its definition of embryonic stem cells "that could have a big effect on [stem cells'] long-term ability to lead to cures for a variety of diseases," the Los Angeles Times' "Booster Shots" reports (Kaplan, "Booster Shots," Los Angeles Times, 2/19). Under the new NIH guidelines on federally funded stem cell research issued in July 2009, embryonic stem cells that can be used in federally funded research are generated from the blastocyst, an embryonic stage reached five days after fertilization...
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