Blackburn and Szostak determined that it was a specific DNA sequence in the telomeres that kept chromosomes from fraying whenever they were copied when a cell splits in two.

布莱克本和卓斯塔克测定，端粒中一段特殊的DNA序列在细胞分裂染色体自我复制时保护了染色体免受损耗。

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There are hundreds,thousands of them known now, and each one has a specific character and one aspects of its character is that it only binds and cuts at a particular sequence of DNA.

已知的有成百上千种,每一种都有自己的特性,特性之一是,只结合和切割特定的某一种DNA序列

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This would change when the virus crossed paths with cells containing a very specific DNA sequence, a sequence that would act as a molecular key to unlock secondary functions that were not so benign.

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