Invariably beginning approximately 15 nucleotides 
Invariably beginning approximately 15 nucleotides downstream from an AAUAAA sequence, recent studies suggest that its processing complex may become physically associated with RNA polymerase as it synthesizes the primary transcript. Serving as a recognition site for protein complexes and preventing premature degradation by exonucleases, FTP, what is this string of adenosine residues found at the 3-prime end of eukaryotic mRNA molecules?
Invariably beginning approximately 15 nucleotides downstream from an AAUAAA sequence, recent studies suggest that its processing complex may become physically associated with RNA polymerase as it synthesizes the primary transcript.
the {poly(A) tail}