nucleolus organizer region

例句：

1. 1. The nucleolus organizer region is acritical part of the cell's structure.
   核仁组织区是细胞结构中至关重要的部分。
2. 2. The study of the nucleolus organizer region has led to newinsights into gene expression.
   对核仁组织区的研究表明了基因表达的新见解。
3. 3. The nucleolus organizer region plays acrucial role in the development of the brain.
   核仁组织区在大脑发育中起着关键作用。