几乎自然界中所有的物种，从单细胞生物到哺乳动物(包括人类)，都具有一种日常活动周期，称为昼夜节律。
Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called circadian rhythm.
研究人员发现了驱动我们身体功能及行为的日常节律的哺乳动物生物钟的一个新的成分。
Researchers have identified a new piece of the mammalian circadian clock, which drives the daily rhythms of our bodily functions and behavior.
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