Recently geneticists have taken a closer look at a genetic aberration previously considered rare: copy number variation (CNV).

最近遗传学家对以前被认为很罕见的遗传变异：拷贝数变异（copy number variation ，CNV）进行了更细致的研究。

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"The copy number variation that researchers had seen before was simply the tip of the iceberg, while the bulk lay submerged, undetected," said Dr Hurles.

“研究人员以前看到的复制数量变化只是冰山一角，而其绝大部分都还未浮出水面，未被发现，”赫尔斯博士说。

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DEFB gene products are small antimicrobial proinflammatory peptides, and copy number variation (CNV) could reasonably influence susceptibility to infection and inflammation.

DEFB基因产物是小分子抗菌肽，且拷贝数变化(CNV)可显著影响易感性及炎症反应。

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For example, a recent (2007) study by Sebat et al. found a clear link between ASD and de novo copy number variation (de novo mutations are those that arise for the first time in the children).

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Universal grammar allows for variation along a certain number of parameters, and this explains the grammatical variation we observe in natural language.

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The result is variation in the number of copies of that sequence, a variability we call CNV.

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