title: Polar mutations in lac, gal and phage lambda consist of a few IS-DNA sequences inserted with either orientation.
mesh_terms: D000595:Amino Acid Sequence; D003090:Coliphages; D004269:DNA, Bacterial; D004279:DNA, Viral; D004926:Escherichia coli; D005827:Genetics, Microbial; D008854:Microscopy, Electron; D009154:Mutation; D009876:Operon
chemical_list: D004269:DNA, Bacterial; D004279:DNA, Viral