title: DNA supercoiling and gene expression.
mesh_terms: D004264:DNA Topoisomerases, Type I / Q000235:genetics; D004250:DNA Topoisomerases, Type II / Q000235:genetics; D004278:DNA, Superhelical; D004926:Escherichia coli / Q000235:genetics; D005786:Gene Expression Regulation
chemical_list: D004278:DNA, Superhelical; D004264:DNA Topoisomerases, Type I; D004250:DNA Topoisomerases, Type II