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A fruitful collaboration between behavioral and molecular biologists has produced a fascinating look at the internal circadian organization of the common vole (Fig. 1). The article by van der Veen et al. (1) published in this issue of PNAS documents the relationship between circadian rhythms in the brain and those in the liver of this small rodent, whose field behavior and unusual feeding habits have been well studied but whose molecular biology has been almost completely ignored.
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Michael Menaker (2006) studied this question.
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