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In this January 31, 1961 file photo, Ham, the first higher primate launched into outer space, is comforted by an unidentified man on the deck of a rescue ship after the splashdown in the Atlantic Ocean. Chimpanzees should hardly ever be used for medical research, a prestigious scientific group told the government Thursday – advice that means days in the laboratory may be numbered for humans' closest relatives. The Institute of Medicine stopped short of recommending the outright ban that animal rights activists had pushed. Instead, it urged strict limits that would make invasive experiments with chimps essentially a last resort, saying today's more advanced research tools mean the primates' use only rarely will be necessary enough to outweigh the moral costs. (Photo by AP Photo)
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