title: Strategies for finding mutants.
authors.forename: J
authors.initials: J
authors.lastname: Beckwith
mesh_terms: D010582:Bacteriophage lambda / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics*; D005798:Genes, Bacterial; D005804:Genes, Lethal; D005814:Genes, Viral; D009154:Mutation; D012486:Salmonella typhimurium / Q000235:genetics*