. "Authored: Timmers, H. T. M., 2003-09-11 07:42:30"^^ . "Formation of the third phosphodiester bond creates a 4-nt product. This commits the initiation complex to promoter escape. The short 4-nt transcript is still loosely associated with the RNA polymerase II initiation complex and can dissociate to yield abortive products, which are not further extended. Inhibition of ATP-hydrolysis by TFIIH does not lead to collapse of the open region any longer. The transcription complex has lost the sensitivity to single-stranded oligo-nucleotide inhibition. However, ATP-hydrolysis and TFIIH are required for efficient promoter escape. The open region (\u00C3\u00A2\u00E2?\u00AC\u00C5?transcription bubble\u00C3\u00A2\u00E2?\u00AC\u00C2?) expands concomitant with the site of RNA-extension. In this case this region spans positions -9 to +4."^^ . "Edited: Joshi-Tope, G, 0000-00-00 00:00:00"^^ . . . . . . . "Addition of the fourth nucleotide on the Nascent Transcript: Second Transition"^^ . "2.7.7.6"^^ . . . . . .