point centromere的用法和样例：
例句
- The duplicates are attached to each other at a constricted region called the centromere.
对偶体彼此相连于称为着丝粒的缩小的区域。 - The centromere contains the kinetochore, a structure involved in the attachment of the chromosomes to the spindle during nuclear division.
着丝点上包含了着丝粒，着丝粒确保细胞在分裂中染色体与纺锤体的整合，发生有序的染色体分离。
