pol II transcription complex containing 9 nucleotide long transcript pol II transcription complex containing 11 nucleotide long transcript NTP Addition of nucleotides 10 and 11 on the growing transcript: Third Transition Authored: Timmers, H. T. M., 2003-09-11 07:42:30 EC Number: 2.7.7.6 Edited: Joshi-Tope, G, 0000-00-00 00:00:00 Formation of phosphodiester bonds nine and ten creates RNA products, which do not dissociate from the RNA pol II initiation complex. The transcription complex has enter the productive elongation phase. TFIIH and ATP-hydrolysis are required for efficient promoter escape. The open region (“transcription bubble”) expands concomitant with the site of RNA-extension. The region upstream from the transcription start site (-9 to -3) collapses to the double-stranded state. TFIIH remains associated to the RNA pol II initiation complex. Pubmed7601352 Pubmed9405375 Reactome Database ID Release 4376576 Reactome, http://www.reactome.org ReactomeREACT_1082 has a Stoichiometric coefficient of 2