'Forrest Gump' mice show too much of a good thing, can be bad

A line of genetically modified mice that scientists call "Forrest Gump" because, like the movie character, they can run far but they aren't smart, is furthering the understanding of a key neurotransmitter called acetylcholine. Scientists say the mice show what happens when too much of this neurotransmitter becomes available in the brain.

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