title: Resistance of Escherichia coli to penicillins. II. An improved mapping of the ampA gene.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial; D003227:Conjugation, Genetic; D004926:Escherichia coli; D010403:Penicillin Resistance; D011995:Recombination, Genetic; D014161:Transduction, Genetic
chemical_list: D000667:Ampicillin