title: Operon polarity in relaxed RNA control strains of Escherichia coli.
mesh_terms: D002247:Carbon Isotopes; D004926:Escherichia coli / Q000378:metabolism; D008025:Ligases / Q000378:metabolism; D008967:Molecular Biology; D012329:RNA, Bacterial / Q000096:biosynthesis*; D014364:Tryptophan / Q000378:metabolism; D014498:Uracil / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D012329:RNA, Bacterial; D014498:Uracil; D014364:Tryptophan; D008025:Ligases