是由着丝粒结合蛋白在有丝分裂期间特别装配起来的、附着于主缢痕外侧的圆盘状结构，内侧与着丝粒结合，外侧与动粒微管结合。每一个中期染色体含有两个动粒，位于着丝粒的两侧。
哺乳动物的动粒可分为三个不同的区域：即内层、中间层和外层，直径约为200nm。
（名词解析）
kinetochore (动粒)
正确答案
答案解析
略
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