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The senescence-accelerated mouse (SAMP8) is an animal model of aging that displays an array of circadian rhythm disruptions as early as 7 months of age. The present study explored the physiological basis for age-related changes in circadian rhythms by measuring c-Fos immunostaining. Cellular activity in the SCN “core” and “shell” was examined for 2-, 7-, and 12-month-old SAMP8 at circadian times (CTs)...
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