title: Tryptophan-requiring parental strains yield Salmonella typhimurium x Escherichia coli hybrid recombinants with functional tryptophan operons.
abstract: Crosses between an Escherichia coli Hfr trp strain and three Salmonella typhimurium F- trp strains produced some trp+ hybrids in which the tryptophan operon is composed of genes from both parental species.
mesh_terms: D003433:Crosses, Genetic; D004926:Escherichia coli / Q000235:genetics*; D009876:Operon; D010641:Phenotype; D012486:Salmonella typhimurium / Q000235:genetics*; D014364:Tryptophan / Q000235:genetics*
chemical_list: D014364:Tryptophan