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You might be interested to know that the aaaaaa at the end is called the poly(A) tail and it terminates the mRNA produced in the nuclei of most healthy Eukaryotic cells. It promotes the translation of the RNA into protein. Also, it is gradually reduced in length, until the mRNA is broken down. RNA viruses also have these tails, for similar reasons. Having an extremely long tail would presumably keep the viral RNA replicating in our cells for longer.

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