Thirty Mouse Strain Survey of Voluntary Physical Activity and Energy Expenditure: Influence of Strain, Sex and Day-Night Variation.

FVB appeared again without day–night difference for this trait ( p = 0.83) and 129X1 were marginally significant, but, when analyzed at the sex-separated level, both sexes lacked a day–night difference.

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Results Body Weight Is a Sexual Dimorphic Trait and Highly Variable With the Strain Background Body weight showed a broad distribution across the strains and, as expected, underlay a highly significant strain and sex effect ( Figures 1A,B ).

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