The genes that control the body clock are most active in parts of the brain called the suprachiasmatic nuclei.

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。

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For years, scientists thought that neurons in the brain's suprachiasmatic nuclei, or SCN, regulated our body clocks by firing a lot during the day and less at night.

很多年来，科学家们认为大脑的视交叉上核(scn)是生物钟中枢，具体机制是此处的神经元白天比夜间更兴奋。

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Unlike the rest of the cells in your body, your red blood cells lack nuclei.

不同于身体的其他细胞，你的红细胞是没有细胞核的。

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