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If you consider a transcribing RNA pol II with a transcript as small as 30 bases, which serine residue in its CTD will be phosphorylated?

If you consider a transcribing RNA pol II with a transcript as small as 30 bases, which serine residue in its CTD will be phosphorylated? Correct Answer 5

when RNA transcript is only 30 bases long it is still within the initiation range. Then the 2nd serine residue is phosphorylared only.

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