未来威胁人类的不是外星人，也不是罕见的疾病，而是气候变化。

It's neither aliens nor a rare disease that will threaten the human race in the future, but climate change.

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当异常半球中的神经元在成熟之前经历过多的细胞分裂时，就会发生这种罕见的疾病，即大脑一侧长得比另一侧大得多。

The rare disorder, in which one side of the brain grows substantially larger than the other, occurs when neurons in the abnormal hemisphere undergo too many cell divisions before they mature.

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其中有两种编码突变也会引发粘脂沉积症——一种罕见的疾病。

Two of the encode mutations involved are also known to cause a rare disease called mucolipidosis.

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