title: A study in evolution: the histidine utilization genes of enteric bacteria.
mesh_terms: D004269:DNA, Bacterial; D005796:Genes; D006639:Histidine / Q000378:metabolism*; D007711:Klebsiella pneumoniae / Q000235:genetics*; D008854:Microscopy, Electron; D009691:Nucleic Acid Denaturation; D009692:Nucleic Acid Heteroduplexes; D009693:Nucleic Acid Hybridization; D012333:RNA, Messenger; D012486:Salmonella typhimurium / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D009692:Nucleic Acid Heteroduplexes; D012333:RNA, Messenger; D006639:Histidine