为了使自然选择得以进行，不同的变异对于各类人种大概都是适用的。
Presumably, different mutations were available in each population for natural selection to work on.
基因变异的确切性质及它们怎样发挥功能尚不清楚，因此功能性研究和应用其他人种的样品进行研究可能会更加有启示。
The exact nature of the gene variants and how they function are still unknown, so functional studies as well as studies using additional ethnic population samples may be quite revealing.
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