title: Immediate cessation of transcription of an operator-proximal segment of the tryptophan operon in Escherichia coli following repression of the operon.
mesh_terms: D004926:Escherichia coli; D005809:Genes, Regulator; D005815:Genetic Code; D012316:RNA Nucleotidyltransferases / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis / Q000378:metabolism; D013997:Time Factors; D014364:Tryptophan / Q000096:biosynthesis*
chemical_list: D012333:RNA, Messenger; D014364:Tryptophan; D012316:RNA Nucleotidyltransferases