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Adding an extra version of a single gene makes mice grow big brains -- brains so large they have to fold up, much as human brains do, to fit inside the skull, researchers said on Thursday.

It is not yet clear whether the mice are smarter -- they were all killed soon after birth -- but the scientists said they were surprised that one gene had such a strong effect and said they would do further experiments.
By Maggie Fox, Reuters Health and Science
Correspondent