behavior/neurological
• mice exhibit a deficit in spatial learning which develops by 12 months and 18 months as determined by performance in Barnes maze
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• mice exhibit a deficit in spatial memory which develops by 12 months and 18 months as determined by performance in Barnes maze and radial arm maze
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• males exhibit anxiety as determined by marble burying test (18 months) and elevated plus maze (12 and 18 months)
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nervous system
• age-dependent neuronal loss in dentate gyrus and CA1 region of hippocampus
• loss is repeat length dependent
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