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The B2 family of short interspersed elements is transcribed into non-coding RNA by RNA polymerase III. The ~180-nt B2 RNA has been shown to potently repress mRNA transcription by binding tightly to RNA polymerase II (Pol II) and assembling with it into complexes on promoter DNA, where it keeps the polymerase from properly engaging the promoter DNA. Mammalian Pol II is an ~500-kDa complex that contains...
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