One of the genes they looked at, called the EDAR gene, is known to be involved in controlling the growth of hair.

他们检查的其中一个叫做EDAR的基因，已知其参与了控制头发的生长。

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A variant form of the EDAR gene is very common in East Asians and Native Americans, and is probably the reason that these populations have thicker hair than Europeans or Africans.

一个EDAR基因的变种形式在东亚人和美洲原住民中非常普遍，可能是这些人口拥有比欧洲人或非洲人更厚的头发的原因。

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