title: Typing of Rhizobium meliloti mutants by means of phages.
mesh_terms: D000942:Antigens, Bacterial; D001434:Bacteriophage Typing; D009153:Mutagens; D009154:Mutation; D009573:Nitrites; D012231:Rhizobium / Q000145:classification / Q000276:immunology / Q000472:pathogenicity; D014774:Virulence
chemical_list: D000942:Antigens, Bacterial; D009153:Mutagens; D009573:Nitrites