title: Classification and intragenic position of mutations in the beta-galactosidase gene of Escherichia coli.
mesh_terms: D002869:Chromosome Aberrations; D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial; D004926:Escherichia coli; D005696:Galactosidases / Q000096:biosynthesis*; D005815:Genetic Code; D006146:Guanidines / Q000494:pharmacology; D009154:Mutation / Q000187:drug effects*; D009603:Nitroso Compounds / Q000494:pharmacology; D009876:Operon; D011995:Recombination, Genetic
chemical_list: D006146:Guanidines; D009603:Nitroso Compounds; D005696:Galactosidases