title: In vivo and in vitro initiation of transcription.
mesh_terms: D001483:Base Sequence; D003090:Coliphages; D004261:DNA Replication; D004267:DNA Viruses; D004279:DNA, Viral; D012333:RNA, Messenger; D014158:Transcription, Genetic
chemical_list: D004279:DNA, Viral; D012333:RNA, Messenger