The National Institutes of Health has announced that it will end its support for invasive research on chimpanzees and retire the 50 chimps that it had set aside for future biomedical research.
The decision, announced on Wednesday, brings to a close years of controversy about federally funded primate experimentation, and follows a 2013 decision by the N.I.H. to retire all but 50 of its chimpanzees to animal sanctuaries.
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