title: A mechanism for repressor action.
mesh_terms: D004926:Escherichia coli / Q000378:metabolism; D005809:Genes, Regulator; D005815:Genetic Code; D008967:Molecular Biology; D009154:Mutation; D009876:Operon; D012316:RNA Nucleotidyltransferases; D012333:RNA, Messenger / Q000096:biosynthesis; D014466:Ultraviolet Rays
chemical_list: D012333:RNA, Messenger; D012316:RNA Nucleotidyltransferases