Posttranscriptional mRNA processing includes 5 '-capping, splicing and poly-adenylation at the 3' end.

RNA转录后加工的主要步骤有5端加帽，剪接和3端多聚腺苷酸化。

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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

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