A study of genetically identical mice is providing some hints about humans. How can one identical twin be a wallflower while the other is the life of the party?
The study of 40 young mice found that their behavior grew increasingly different over three months, even though the mice shared the same genes and lived in the same five-level cage, researchers report Thursday in the journal Science.
The finding could help scientists finally figure out how one identical twin can become very outgoing while the other remains shy, says Eric Turkheimer, a psychologist at the University of Virginia.
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