以下为句子列表：
英文: Chromatid One of a pair of replicated chromosomes found during the prophase and metaphase stages of mitosis and meiosis.
中文: 染色单体：在有丝分裂和减数分裂的前期和中期一对已经复制了的染色体中的一个。
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英文: Cultured epithelial cell undergoing division. This cell is in metaphase of mitosis. Microtubules are shown in green, actin is in red and mitotic chromosomes are colored blue.
中文: 正处于有丝分裂中期的动物上皮细胞。绿色的是微丝，红色为肌动蛋白，蓝色的染色体正处于赤道板。
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英文: Equatorial plate An arrangement of the chromosomes in which the centromeres become aligned in a single plane at the center of the spindle during metaphase of mitosis and meiosis.
中文: 赤道板：在细胞有丝分裂和减数分裂的中期，横隔在细胞中央的一个平面，位于纺锤体的中心。染色体的着丝粒沿这个平面排列。
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英文: But during the transition from metaphase to anaphase, APC is activated and it discomposes the securin. Then the separse what is a protease has activity and it discompose cohesin. So the sister chromatids separate.
中文: 通常情况下分离酶受到保全素(securin/PTTG)的抑制而没有活性,当细胞从有丝分裂中期向后期转变时,APC(anaphase-promoting complex, 后期促进复合体)被激活并裂解保全素,具有蛋白酶活性的分离酶裂解粘合姐妹染色单体的粘合素(cohesin),姐妹染色单体分离。
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英文: It was shown that the metaphase index reached as high as 70%～80% in mitosis;
中文: 果表明,染色体有丝分裂中期指数(metaphase index)可达70%~80%;
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