Exicon

例句：

1. 1. Exons are the parts of DNA that code for protein.
   外显子是编码蛋白质的DNA部分。
2. 2. The study of exons is essential to understanding genetic diseases.
   研究外显子对于理解遗传疾病至关重要。
3. 3. The discovery of a new gene led to the development of a cure for cancer.
   发现一种新的基因导致了癌症治疗方法的开发。