来自《耶鲁大学开放课程：生物医学工程探索 第4集 第4集》

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  That's an example of symmetric sequence
  这是一个对称序列的例子
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  and it happens that most restriction enzymes also recognize those spaces.
  大多数限制性内切酶都能识别这些序列
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  If you cut and you open up a segment of DNA
  如果你进行切割打开一个DNA片段
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  then you've left these sticky ends, for example
  就会留下 比如说 这些粘性末端
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  and these sticky ends are capable of recognizing each other by the process of hybridization.
  这些粘性末端能在杂交的过程中互相识别
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  These will naturally want to reform and they'll want to reform to re-establish this base pairing.
  它们会自然地重新进行碱基配对
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  They could be pasted back together,
  它们可以重新粘合在一起
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  and the pasting process
  而这粘合的过程
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  takes advantage of this natural process of complimentary hybridization.
  得益于这种自然的互补杂交
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  This gives you a biological mechanism for cutting,
  这是一种切割DNA的生物机制
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  using restriction enzymes,
  用限制性内切酶
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  and then you denature so that it falls apart,
  改变DNA的性质让它打开