PathwayStep236 PathwayStep240 PathwayStep246 RNA Polymerase II Promoter Opening: First Transition RNA Polymerase II Transcription Initiation And Promoter Clearance Reactome Database ID Release 4376042 Reactome, http://www.reactome.org ReactomeREACT_834 RNA Polymerase II Transcription Initiation RNA Polymerase II Promoter Escape