title: Plasmid R1 in Salmonella typhimurium: molecular instability and gene dosage effects.
mesh_terms: D003227:Conjugation, Genetic; D004269:DNA, Bacterial / Q000235:genetics; D004270:DNA, Circular / Q000235:genetics; D005796:Genes; D009154:Mutation; D010641:Phenotype; D010957:Plasmids; D011815:R Factors; D012293:Rifampin / Q000494:pharmacology; D012486:Salmonella typhimurium / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular; D012293:Rifampin