title: Electron microscopy of polar insertions in the lac operon of Escherichia coli.
mesh_terms: D002874:Chromosome Mapping; D003090:Coliphages; D004269:DNA, Bacterial; D004926:Escherichia coli; D005827:Genetics, Microbial; D008242:Lysogeny; D008854:Microscopy, Electron; D009154:Mutation; D009876:Operon
chemical_list: D004269:DNA, Bacterial