extranuclear genetic element

例句：

1. 1. The extrachromosomal genetic element plays a crucial role in the development of cancer cells.
   核外遗传元件在癌症细胞的发展中起着至关重要的作用。
2. 2. Researchers have identified several extrachromosomal genetic elements that may contribute to disease susceptibility.
   研究人员已经识别出几种可能增加疾病易感性的核外遗传元素。
3. 3. In this study, we focused on the extrachromosomal genetic elements that are involved in the regulation of gene expression.
   在本研究中，我们专注于参与基因表达调控的核外遗传元素。