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Science  26 Feb 2010:
Vol. 327, Issue 5969, pp. 1069
DOI: 10.1126/science.327.5969.1069-b

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ScienceInsider reported this week that the U.S. National Institutes of Health has widened its definition of what constitutes a human embryonic stem cell to keep up with what's happening in the lab and that the new definition would include lines derived from embryos before the blastocyst stage, among other stories.