title: Thymine-requiring Escherichia coli mutants isolated from animals. An unusual type of resistance to trimethoprim.
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects / Q000378:metabolism*; D004927:Escherichia coli Infections / Q000378:metabolism / Q000662:veterinary; D009154:Mutation; D012641:Selection, Genetic; D013941:Thymine / Q000378:metabolism*; D014295:Trimethoprim / Q000494:pharmacology*
chemical_list: D014295:Trimethoprim; D013941:Thymine