text: Transcription factor II F (TFF) is one of several general transcription factors that make up the RNA polymerase II preinitiation complex.
  TFF is encoded by the , , and  genes.
  TFF binds to RNA polymerase II when the enzyme is already unbound to any other transcription factor, thus preventing it from contacting DNA outside the promoter. Furthermore, TFF stabilizes the RNA polymerase II while it's contacting TBP and TFB.