title: Use of lac gene fusions to study transport proteins.
mesh_terms: D004926:Escherichia coli / Q000235:genetics*; D005696:Galactosidases / Q000235:genetics*; D005796:Genes; D005798:Genes, Bacterial; D005818:Genetic Engineering / Q000379:methods; D008320:Maltose / Q000378:metabolism*; D008565:Membrane Proteins / Q000235:genetics*; D001616:beta-Galactosidase / Q000235:genetics*
chemical_list: D008565:Membrane Proteins; D008320:Maltose; D005696:Galactosidases; D001616:beta-Galactosidase