title: Evidence for supercoiling in the DNA of bacteriophage heads.
mesh_terms: D010582:Bacteriophage lambda / Q000032:analysis*; D001435:Bacteriophages / Q000032:analysis*; D004278:DNA, Superhelical; D004279:DNA, Viral; D004996:Ethidium / Q000494:pharmacology; D008466:Mechlorethamine / Q000494:pharmacology; D008854:Microscopy, Electron; D008956:Models, Chemical; D009231:Myxococcales; D009690:Nucleic Acid Conformation / Q000187:drug effects
chemical_list: D004278:DNA, Superhelical; D004279:DNA, Viral; D008466:Mechlorethamine; D004996:Ethidium