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• Biologists Question Adult Stem-Cell Versatility 

  DeWitt, Natalie; Knight, Jonathan (2002-03-28)
• The other stem-cell debate: To test the potential curative powers of human embryonic stem cells, biologists want to inject them into lab animals. Creating such chimeras makes perfect sense, to a point: a sheep with a human liver? O.K. A mouse brain made up of human cells? Maybe. But a chimp that sobs? 

  Shreeve, Jamie (2005-04-10)
• A bill to provide increased Federal funding for stem cell research, to expand the number of embryonic stem cell lines available for Federally funded research, to provide ethical guidelines for stem cell research, to derive human pluripotent stem cell lines using techniques that do not create an embryo or embryos for research or knowingly harm embryos, and for other purposes 

  United States. Congress. Senate (2007-01-23)