title: Evidence of cruciform structures in superhelical DNA provided by two-dimensional gel electrophoresis.
mesh_terms: D004278:DNA, Superhelical; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D004926:Escherichia coli; D009690:Nucleic Acid Conformation; D010957:Plasmids
chemical_list: D004278:DNA, Superhelical