RNA polymerase II
Protein complex that transcribes DNA / From Wikipedia, the free encyclopedia
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RNA polymerase II (RNAP II and Pol II) is a multiprotein complex that transcribes DNA into precursors of messenger RNA (mRNA) and most small nuclear RNA (snRNA) and microRNA.[1][2] It is one of the three RNAP enzymes found in the nucleus of eukaryotic cells.[3] A 550 kDa complex of 12 subunits, RNAP II is the most studied type of RNA polymerase. A wide range of transcription factors are required for it to bind to upstream gene promoters and begin transcription.