has also been identified as a cap in plants, human, and yeast, with scientists proposing this may be a mechanism to regulate gene expression via metabolites.

3' processing

Cleavage and polyadenylation

The pre-mRNA processing at the 3' end of the RNA molecule involves cleavage of its 3' end and then the addition of about 250 adenine residues to form a poly(A) tail. The cleavage and adenylation reactions occur primarily if a polyadenylation signal sequence

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