behavior/neurological
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• increased latency to fall (rotarod test) observed at 6, 12, 13, 16 and 18 months of age as compared to controls
• trained mutant mice remain on rotarod longer than trained wild type at all speeds tested (5, 10, 15 and 20 rpm) and spend less time "distracted" while on the rod
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homeostasis/metabolism
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• striatal serotonin levels are increased at 12 and 18 months of age
• hippocampal serotonin levels are increased in 15 months old mice
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