SCIENTISTS AT JOHNS HOPKINS UNIversity in Baltimore knew something was wrong. Every morning when they checked the lab where their experimental animals were housed, they found one or two dead mice. At first they thought the rodents, whose genes had been manipulated to block production of a key neurotransmitter, might be having heart attacks. But when they looked more closely at the cages, they found bloodstains and tufts of fur, evidence suggesting an even more chilling possibility.
Was there a murderer among the mice? Indeed there was. In a paper published in Nature last week, a team from Johns Hopkins and...
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