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The positive transcription elongation factor, P-TEFb, is required for the production of mRNAs, however the majority of the factor is present in the 7SK snRNP where it is inactivated by HEXIM1. Expression of HIV-1 Tat leads to release of P-TEFb and HEXIM1 from the 7SK snRNP in vivo, but the release mechanisms are unclear.
Pubmed ID: 20808803 RIS Download
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Cell line HeLa is a Cancer cell line with a species of origin Homo sapiens
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