DNA methylation

例句：

1. 1. DNA methylation plays a crucial role in the development of cancer cells.
   DNA甲基化在癌细胞的发展中起着关键作用。
2. 2. The study found that DNA methylation is associated with increased risk of Alzheimer's disease.
   研究发现，DNA甲基化与阿尔茨海默病的风险增加有关。
3. 3.DNA methylation is a process by which certain genes are silenced or turned off during embryonic development.
   DNA甲基化是一种过程，在胚胎发育过程中某些基因被沉默或关闭。