Threats, booby-trapped envelopes rigged with razor blades, and beatings with baseball bats have scared biomedical researchers out of the field and slowed advances in human health care, say endocrinologist Michael Conn and his coauthor, James Parker. Twenty years . ago animal rights activists would meet with scientists to discuss their concerns openly, the authors write, but over the past decade a wing of the movement has become so violent that in 2005 the FBI called it "one of today's most serious domestic terrorism threats."
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