哺乳动物中调节昼夜节律的是两个调节神经细胞群，称为视交叉上核中的下丘脑。

The circadian rhythm in mammals is regulated by two clusters of nerve cells called the suprachiasmatic nuclei (SCN) in the anterior hypothalamus.

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例如，由于iPS的衍生心脏细胞可以在培养皿中搏动，科学家能以此检测改变心脏节律的药物。

For instance, since the iPS-derived heart cells will beat in a dish, scientists should be able to detect which drugs alter the heart's rhythm.

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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.

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