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| RNA, Messenger Messenger RNA | Messenger RNA, Polyadenylated | Poly(A) Tail | Poly(A)+ RNA | Poly(A)+ mRNA | RNA, Messenger, Polyadenylated | RNA, Polyadenylated | mRNA | mRNA, Non-Polyadenylated | mRNA, Polyadenylated | Non-Polyadenylated mRNA | Poly(A) RNA RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm. |