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Science 18 July 2003:
Vol. 301. no. 5631, pp. 326 - 328
DOI: 10.1126/science.1085935

Review

Circadian Clocks in Daily and Seasonal Control of Development

Thomas F. Schultz and Steve A. Kay*

The rotation of the earth results in regular changes in the light environment, and organisms have evolved a molecular oscillator that allows them to anticipate these changes. This daily molecular oscillator, known as the circadian clock, regulates a diverse array of physiologies across a wide variety of organisms. This review highlights a few of the insights we have into circadian clock regulation of development, in both plants and animals. A common thread linking plants and animals is the use of the circadian clock to sense changes in day length and to mediate a diverse number of photoperiodic responses.

Department of Cell Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

* To whom correspondence should be addressed. E-mail: stevek{at}scripps.edu

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