April 24, 2011 12:01 AM

Some chimps never recover from stresses of research

The debate about medical testing on chimpanzees often revolves around the physical impact on the chimps — week after week of liver biopsies or year after year of being infected with HIV or hepatitis. But an examination by McClatchy of the chimp-research world found that, in addition to a physical toll, the testing life can have a significant impact on a chimp's mental state.

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