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Transcription initiation factor IIA, gamma subunit Accurate transcription in vivo requires at least six general transcription initiation factors, in addition to RNA polymerase II. Transcription initiation factor IIA (TFIIA) is a multimeric protein which facilitates the binding of TFIID to the TATA box. The C-terminal domain of the gamma subunit is a 12 stranded beta-barrel.
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