title: The recovery of tryptophan A auxotrophs at high frequency in a strain of Salmonella typhimurium.
mesh_terms: D009154:Mutation; D012486:Salmonella typhimurium / Q000378:metabolism*; D014161:Transduction, Genetic; D014364:Tryptophan / Q000096:biosynthesis*
chemical_list: D014364:Tryptophan