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In what sequence are the serine residues in RNA pol II phosphorylated?

In what sequence are the serine residues in RNA pol II phosphorylated? Correct Answer 2->7->5

The phosphorylation is at the 2nd serine residue with the help of the TFIIH, and then during elongation the phosphorylation is at the 5th serine residue. Between these two there is a short phase of phosphorylation at the 7th serine.

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