That messenger RNA that's being used has already gone through the RNA splicing mechanism and so the introns have already been removed.

这个mRNA,已经经过了RNA剪接机制的剪接,切去了内含子

耶鲁公开课 - 生物医学工程探索课程节选

It's very important in the biological operation of human cells and that step is RNA splicing, or processing of this RNA, single stranded RNA that's produced by transcription.

而这对人类细胞生物运作至关重要,这个步骤就是RNA剪接,或者说是对RNA的加工,对转录出的单链RNA进行加工的步骤

耶鲁公开课 - 生物医学工程探索课程节选