控制节律钟的基因在视交叉上核（大脑的某个部位）上表现得最为活跃，但是与其他基因一样，它们在几乎所有细胞中都存在。
The genes that control the body clock are most active in parts of the brain called the suprachiasmatic nuclei.
目前，科学家们知道，大约有15%的人类基因由生物钟控制。
Scientists now know that about 15 percent of a human's genes are governed by these biological clocks.
科学家们发现了一种能控制人睡眠时间长短的基因，这解释了为什么一些人拥有自己私人的生物钟。
A gene that controls how long we sleep has been discovered by scientists explaining why some people have their own internal alarm clock.
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