title: [Isolation of mutants with abnormal lambda-repressors, operators and promotors].
mesh_terms: D002874:Chromosome Mapping; D003090:Coliphages / Q000187:drug effects / Q000302:isolation & purification*; D005809:Genes, Regulator; D005827:Genetics, Microbial; D008242:Lysogeny; D009153:Mutagens; D009154:Mutation; D009604:Nitrosoguanidines / Q000494:pharmacology; D009876:Operon; D011995:Recombination, Genetic; D013696:Temperature; D014466:Ultraviolet Rays; D014776:Virus Cultivation
chemical_list: D009153:Mutagens; D009604:Nitrosoguanidines