title: Studies on the size of the messenger-RNA transcribed from the histidine operon during simultaneous and sequential depression.
mesh_terms: D002247:Carbon Isotopes; D002499:Centrifugation, Density Gradient; D055598:Chemical Phenomena; D002621:Chemistry; D004794:Enzyme Repression; D005796:Genes; D005815:Genetic Code; D005827:Genetics, Microbial; D006639:Histidine / Q000096:biosynthesis*; D009154:Mutation; D010447:Peptide Hydrolases; D012333:RNA, Messenger / Q000096:biosynthesis*; D012486:Salmonella typhimurium / Q000378:metabolism*; D014316:Tritium; D014529:Uridine / Q000378:metabolism
chemical_list: D002247:Carbon Isotopes; D012333:RNA, Messenger; D014316:Tritium; D006639:Histidine; D010447:Peptide Hydrolases; D014529:Uridine