title: Isolation of Hfr derivative by the use of Shigella flexneri 4b-modified F factor.
mesh_terms: D000166:Acridines / Q000494:pharmacology; D002874:Chromosome Mapping; D003090:Coliphages; D003227:Conjugation, Genetic; D004269:DNA, Bacterial; D004352:Drug Resistance, Microbial; D004926:Escherichia coli; D005827:Genetics, Microbial; D012343:RNA, Transfer; D011995:Recombination, Genetic; D012760:Shigella / Q000187:drug effects / Q000302:isolation & purification*
chemical_list: D000166:Acridines; D004269:DNA, Bacterial; D012343:RNA, Transfer