What makes biological clock tick?

Concar, David
October 1991
New Scientist;10/26/91, Vol. 132 Issue 1792, p33
Explains the mechanisms of the human circadian clock. Effects of light on the circadian rhythm; Discovery of receptors for the enzyme melatonin inside the suprachiasmatic nuclei (SCN) in the hypothalamus; Loss of circadian rhythms in people with tumors near their SCN; Role of melatonin as a timekeeper; Speculations on how cellular rhythms become synchronized to the daily light-dark cycle.


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