title: Isolation of a gene.
mesh_terms: D004269:DNA, Bacterial / Q000302:isolation & purification; D004926:Escherichia coli; D005696:Galactosidases / Q000096:biosynthesis; D005796:Genes; D005827:Genetics, Microbial; D007785:Lactose / Q000378:metabolism; D008967:Molecular Biology
chemical_list: D004269:DNA, Bacterial; D005696:Galactosidases; D007785:Lactose