title: Nalidixic acid-resistant auxotrophs of Escherichia coli.
abstract: purB and ctr mutants of Escherichia coli are resistant to low levels of nalidixic acid.
mesh_terms: D000225:Adenine / Q000378:metabolism; D002874:Chromosome Mapping; D003470:Culture Media; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D005796:Genes; D005827:Genetics, Microbial; D009154:Mutation; D009268:Nalidixic Acid / Q000494:pharmacology*; D011687:Purines / Q000096:biosynthesis
chemical_list: D003470:Culture Media; D011687:Purines; D009268:Nalidixic Acid; D000225:Adenine