title: Unstable mutants of R factor.
mesh_terms: D001419:Bacteria / Q000187:drug effects*; D002701:Chloramphenicol / Q000494:pharmacology; D002874:Chromosome Mapping; D003470:Culture Media; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects; D005827:Genetics, Microbial; D009154:Mutation; D011995:Recombination, Genetic; D012475:Salmonella / Q000187:drug effects; D013307:Streptomycin / Q000494:pharmacology; D013424:Sulfanilamides / Q000494:pharmacology; D013752:Tetracycline / Q000494:pharmacology
chemical_list: D003470:Culture Media; D013424:Sulfanilamides; D002701:Chloramphenicol; D013752:Tetracycline; D013307:Streptomycin