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Science 27 October 2000:
Vol. 290. no. 5492, pp. 799 - 801
DOI: 10.1126/science.290.5492.799
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Reports

Antiphase Oscillation of the Left and Right Suprachiasmatic Nuclei

Horacio O. de la , Iglesia,* Jennifer Meyer, Alan Carpino Jr., William J. Schwartz

An unusual property of the circadian timekeeping systems of animals is rhythm "splitting," in which a single daily period of physical activity (usually measured as wheel running) dissociates into two stably coupled components about 12 hours apart; this behavior has been ascribed to a clock composed of two circadian oscillators cycling in antiphase. We analyzed gene expression in the hypothalamic circadian clock, the suprachiasmatic nucleus (SCN), of behaviorally "split" hamsters housed in constant light. The results show that the two oscillators underlying the split condition correspond to the left and right sides of the bilaterally paired SCN.

Department of Neurology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655, USA.
*   To whom correspondence should be addressed. E-mail: hacho{at}bio.umass.edu

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