Biological Clocks Coordinately Keep Life on Time

Science  19 Aug 2005:
Vol. 309, Issue 5738, pp. 1196-1198
DOI: 10.1126/science.1111420

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Many biological processes, including cell division, metabolism, and seasonal flowering, are controlled by cycles of activity. Mechanisms called biological clocks maintain these cycles. In their Perspective, Gillette and Sejnowski discuss how some clocks do not operate independently of others. Rather, clocks may interact such that the state of one system can alter another.