accurate initiation at promoters by rna polymerase ii in a highly purified transcription system from rat liver depends on five accessory factors , which comprise two functional classes : ( i ) `` '' promoter recognition '' '' factors , designated tau and epsilon , which interact with template dna to form an initial complex that serves as a recognition site for binding by rna polymerase ii and ( ii ) `` '' rna chain initiation '' '' factors , designated alpha , beta gamma , and delta , which do not participate in initial complex formation , but which are essential for initiation ( conaway , j. w. , reines , d. , and conaway , r. c. ( 1990 ) j. biol . chem . 265 , 7552-7558 ) .
C0040649
transcription
C0035668
`` ''