Scientists locate cell cluster that regulates biological clock rhythms.

From: St. Louis Post-Dispatch (St. Louis, MO) | Date: March 7, 2005 | Copyright information

Byline: Tina Hesman

ST. LOUIS _ A VIP wake-up call gives biological clocks rhythm, Washington University researchers have found.

In people and animals, sleep, wake and a variety of biological processes (scientists call them circadian rhythms, meaning "about a day") are governed by a single master clock in the brain. That clock is really a cluster of about 10,000 brain cells called the suprachiasmatic nucleus, situated straight up from the roof of the mouth at about the level of the bridge of the nose.

Scientists have been studying the inner cogs of the circadian ...

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