title: Genetic analysis of ColB factors and the identification of composite circular molecules of R-factors.
mesh_terms: D001412:Bacillus subtilis; D001431:Bacteriological Techniques; D003087:Colicins; D004269:DNA, Bacterial; D004352:Drug Resistance, Microbial; D004926:Escherichia coli; D005827:Genetics, Microbial; D008967:Molecular Biology; D009154:Mutation; D011511:Proteus
chemical_list: D003087:Colicins; D004269:DNA, Bacterial