The R factors.

Adenosine Triphosphate Ampicillin/pharmacology Anti-Bacterial Agents/pharmacology Bacteria/analysis,drug effects,isolation & purification Biological Transport Cell Membrane Permeability Chloramphenicol/pharmacology Coenzymes Culture Media DNA, Bacterial/analysis Escherichia coli/drug effects Genetics, Microbial Kanamycin/pharmacology Klebsiella/drug effects Mutation Nucleotides/analysis Pasteurella/drug effects Penicillin Resistance Proteus/drug effects Recombination, Genetic Salmonella/drug effects Shigella/drug effects Streptomycin/pharmacology Sulfanilamides/pharmacology Tetracycline/pharmacology

Anti-Bacterial Agents Coenzymes Culture Media DNA, Bacterial Nucleotides Sulfanilamides Kanamycin Chloramphenicol Ampicillin Adenosine Triphosphate Tetracycline Streptomycin