来自《耶鲁大学开放课程：生物医学工程探索 第3集 第3集》

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  examples of where RNA processing is important.
  进一步说明为什么RNA的加工如此重要
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  For now, just think about modifying your picture
  现在你们只要修改一下
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  of this sort of information flow
  脑海中遗传信息表达的整个流程
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  through a cell to include another step
  加一个步骤进去
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  that RNA is produced by transcription from DNA,
  RNA从DNA转录出来
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  double stranded DNA goes to a single stranded RNA molecule,
  双链的DNA转录为单链的RNA分子
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  and that RNA is processed in the cell
  然后RNA在细胞中被加工剪接
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  in some way in order to form messenger RNA.
  最终形成信使RNA
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  One of the forms of processing that happens,
  在人类的基因表达中
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  that's very important in human gene expression
  有一种非常重要的加工形式
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  is that some of the sections of the DNA molecule
  那就是在DNA分子中有一些片段
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  are not really necessary for describing the protein.
  对于编码蛋白质而言毫无用处