title: Supercoiled DNA.
mesh_terms: D004261:DNA Replication; D004264:DNA Topoisomerases, Type I / Q000378:metabolism; D004270:DNA, Circular / Q000378:metabolism; D004278:DNA, Superhelical / Q000378:metabolism; D004279:DNA, Viral / Q000378:metabolism; D004587:Electrophoresis, Agar Gel; D004996:Ethidium / Q000494:pharmacology; D008433:Mathematics; D008854:Microscopy, Electron; D008956:Models, Chemical; D009690:Nucleic Acid Conformation / Q000187:drug effects; D011120:Polyomavirus / Q000235:genetics
chemical_list: D004270:DNA, Circular; D004278:DNA, Superhelical; D004279:DNA, Viral; D004264:DNA Topoisomerases, Type I; D004996:Ethidium