Six female mice were studied separately for six weeks, first in constant light (300 lx), and then on a 12 : 12 L : D schedule (light on 07:00-19:00 h). Food and water were available ad libitum. Abdominal temperature and spontaneous locomotor activity were measured every 10 min.In constant light, the animals free-ran with both temperature and activity records showing circadian rhythms that were significantly greater than 24 h; by contrast, in the LD schedule, the circadian rhythms had become entrained and show…
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