title: Polar mutations and operon function.
mesh_terms: D000115:Acetylesterase / Q000096:biosynthesis; D004247:DNA / Q000378:metabolism; D004798:Enzymes / Q000096:biosynthesis; D004926:Escherichia coli / Q000378:metabolism; D005696:Galactosidases / Q000096:biosynthesis; D005796:Genes; D005809:Genes, Regulator; D005815:Genetic Code; D005827:Genetics, Microbial; D007785:Lactose / Q000378:metabolism; D026901:Membrane Transport Proteins / Q000096:biosynthesis; D008954:Models, Biological; D009154:Mutation; D010452:Peptide Biosynthesis; D014176:Protein Biosynthesis; D012328:RNA Viruses / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism; D014364:Tryptophan / Q000096:biosynthesis
chemical_list: D004798:Enzymes; D026901:Membrane Transport Proteins; D012333:RNA, Messenger; D014364:Tryptophan; D004247:DNA; D000115:Acetylesterase; D005696:Galactosidases; D007785:Lactose