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Science 16 May 2008:
Vol. 320. no. 5878, pp. 879 - 880
DOI: 10.1126/science.1158619
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Perspectives

CIRCADIAN RHYTHMS:
Integrating Circadian Timekeeping with Cellular Physiology

Marie C. Harrisingh and Michael N. Nitabach

Models of circadian timekeeping mechanisms in plants, flies, and mammals are expanding to include intracellular small-molecule signals.

Department of Cellular and Molecular Physiology, Yale School of Medicine, New Haven, CT 06520, USA. E-mail: michael.nitabach{at}yale.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)