人类基因组拷贝数变异缺失在数量上也有很大的不同，有些人的缺失数甚至能达到几百万。

There is a wide variation in the amount of these CNV deletions which people have in their genome, with some people having several million.

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研究人员发现，在个子比较矮的人身上，会出现低发生率拷贝数变异过剩——部分基因组缺失。

And the researchers found an excess of low frequency CNV deletions - where part of the genome is missing - in shorter people.

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研究结果表明至少有10%—20%的基因活性方面的遗传变异归功于变异基因拷贝数方面的因素。

The results show that at least 10-20% of heritable variation in gene activity is due to CNVs.

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