Recently geneticists have taken a closer look at a genetic aberration previously considered rare: copy numbervariation (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 numbervariation that researchers had seen before was simply the tip of the iceberg, while the bulk lay submerged, undetected," said Dr Hurles.
DEFB gene products are small antimicrobial proinflammatory peptides, and copy numbervariation (CNV) could reasonably influence susceptibility to infection and inflammation.