染色体的主缢痕，使姐妹染色单体连在一起，在其两侧各有一个由蛋白构成的动粒。

Centromere --- The primary constriction on the chromosome, a region at which the sister chromatids are held together and at which the kinetochore is formed.

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随着染色体的复制，着丝粒始终连接着形成的两个染色单体。

Following the replication of chromosomes resultant chromatids remain attached at the centromere.

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在结构上，染色体型断裂、染色单体型断裂、双着丝粒、双微小体这些畸变，差异也非常显著（P<0.01）。

Structurally, the aberrations of the chromosome-type break, chromatid break, double minute chromosome were also remarkably different (P<0.01).

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