. "At the beginning of this reaction, 1 molecule of 'pol II transcription complex containing 4-9 nucleotide long transcript' is present. At the end of this reaction, 1 molecule of 'template DNA:4-9 nucleotide transcript hybrid', 1 molecule of 'TFIIH', 1 molecule of 'TFIIE', and 1 molecule of 'RNA Polymerase II (unphosphorylated):TFIIF complex' are present.

This reaction takes place in the 'nucleus'.
"^^ . . .