these five transcription factors comprise two functional classes : ( i ) promoter recognition factors ( tau and epsilon ) , which interact with template dna to facilitate formation of a stable initial complex that is subsequently recognized and bound by rna polymerase ii , and ( ii ) rna chain initiation factors ( alpha , beta gamma , and delta ) , which do not participate in formation of the initial complex , but which are essential for transcription initiation .
C0035668
rna
C1158830
transcription initiation