title: The sense of naturally occurring superhelices and the unwinding angle of intercalated ethidium.
mesh_terms: D002234:Carbodiimides; D055598:Chemical Phenomena; D002621:Chemistry; D003090:Coliphages; D004270:DNA, Circular; D004279:DNA, Viral; D003851:Deoxyribonucleases; D004720:Endonucleases; D004926:Escherichia coli / Q000201:enzymology; D004996:Ethidium; D008854:Microscopy, Electron; D008961:Models, Structural; D009690:Nucleic Acid Conformation; D010179:Pancreas / Q000201:enzymology; D011118:Polynucleotide Ligases
chemical_list: D002234:Carbodiimides; D004270:DNA, Circular; D004279:DNA, Viral; D003851:Deoxyribonucleases; D004720:Endonucleases; D011118:Polynucleotide Ligases; D004996:Ethidium