研究基因如何控制动物行为的研究人员不得不面对许多不确定因素。

Researchers studying how genes control animal behavior have had to deal with many uncertainties.

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然而，最重要的一线希望是控制动物铁的摄入量。

The most promising line of all, though, is to control an animal's intake of iron.

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从脑部到脊椎控制动物前肢的神经细胞源开始演化。

The source of the nerve cells that power the animals’ forelimbs shifted, from the brain to the spinal cord.

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Imagine a virus, for instance, that captured an animal's brain and then modified the animal's brain such that the animal would run out and bite other animals so as to pass on the virus.

想象一个病毒，例如，控制动物大脑，然后修改大脑,这个动物会跑出去咬其他动物,以传播病毒。

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