Criteria creep: the politically motivated extension of a US stem-cell registry makes no scientific sense
Nature 2007 October 18; 449(7164): 756
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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)