如生活方式、自然力量、减少基因变异的行为；还有一些促进这个进程的行为。
Some lifestyles, and some forces of nature, act to reduce genetic variation; others act to promote it.
有的人认为神经生长因子可减少神经变异。
研究人员发现了一些人已经发生了极少量的基因变异，这种变异减少了细胞对某种生长激素（即，胰岛素样生长因子1（IGF1)）的使用。
Researchers have discovered that some people have a rare genetic mutation that decreases their cells' use of a particular growth hormone: insulin-like growth factor 1 (IGF1).
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