Structural basis of Integrator-dependent RNA polymerase II termination - Nature
Briefly

Pol II transcription is regulated by pausing near a +1 nucleosome before transitioning to elongation via phosphorylation by P-TEFb kinase complex.
Integrator complex, consisting of 15 subunits, is involved in targeting paused Pol II for productive elongation or premature termination.
Read at Nature
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