By David Grimm
No researchers have applied for required federal permits to conduct invasive research on chimpanzees living in the United States. That suggests that all U.S. biomedical research on chimps has stopped—or is about to stop—and it’s unclear whether the work will ever start again. Research on chimpanzees has been waning since 2013, when the National Institutes of Health (NIH) announced that it would phase out most government-funded chimp research and retire the majority of its research chimps to sanctuaries.
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