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?
New York Times Magazine 2005 April 10; p. 42-47
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Cowan, Chad A.; Klimanskaya, Irina; McMahon, Jill; Atienza, Jocelyn; Witmyer, Jeannine; Zucker, Jacob P.; Wang, Shunping; Morton, Cynthia C.; McMahon, Andrew P.; Powers, Doug; Melton, Douglas A. (2004-03-25)