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American scientists find more than one "biological clock" in mammals
American scientists recently discovered through animal experiments that there may be more than one biological clock in mammals, which may be the cause of jet lag syndrome. Scientists previously believed that controlling the mammal's biological clock as a "set time" is the transcranial cross-nucleus cell (SCN) in the brain. This cell is like a "walker" for other organs in the animal and contains a gene activity model that follows a 24-hour cycle. British "Nature" magazine website reported on the 4th, in order to understand the way SCN controls organisms, the University of Washington scientists in the experiment changed the experimental rats SCN mode of operation, their physiological cycle from 24 hours to 22 hours. Interestingly, some cells in the experimental mice had their gene activity cycle adjusted to 22 hours, while others were still operating in accordance with the 24-hour cycle. Olasio Iglesias, the neurologist in charge of the study, said that such experiments showed that there are at least two separate circadian clocks in the mouse brain, one sensitive to the alternation of light and darkness, and the other not. Although the researchers used rats for experiments, they thought the findings were suitable for all mammals. Under normal circumstances, the two biological clocks in the body of mammals move in unison, telling other organs of the body to perform various functions. However, when the alternating pattern of light and darkness is disrupted, the two biological clocks act on their own. For example, after a person has experienced a long-distance flight across a time zone, the body is ready for work under the influence of hormones, and the person's sleep cycle is still stuck. The biological process is complex and wonderful, playing “biometric rhythm symphonies†all the time. This research by American scientists undoubtedly opened up another path for mammalian biological rhythm research.