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Body temperature and activity in wild-type (+/+) and PPARβ-null (−/−) mice. Daytime (10 a.m. to 5 p.m.) and nighttime (10 p.m. to 5 a.m.) measurements were made continuously for 14-week-old mice. The body temperature during a 24-hour fast is reported both as the mean of hours 15 to 24 and the minimum during the fast. Values are means ± standard errors of the means (n = 5/group).
