Proceedings: R-Factor conferred ability to mutate to trimethoprim resistance.
D000667:Ampicillin / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects; D009154:Mutation; D010403:Penicillin Resistance; D011815:R Factors; D014295:Trimethoprim / Q000494:pharmacology*
D000667:Ampicillin; D014295:Trimethoprim