the lengths of the products of in vitro transcription , from dna templates which possess the transcription start regions of each of the early genes , were determined and compared to the lengths of dna products generated by s1 nuclease protection and primer extension , in order to demonstrate that the 5 ' termini identified by s1 mapping and primer extension are due to transcription initiation and not to mrna processing .
C0040649
transcription
C1158830
transcription initiation