title: Superhelix density heterogeneity in closed circular intracellular PM2 DNA.
mesh_terms: D001435:Bacteriophages / Q000032:analysis*; D002458:Cell Fractionation; D002499:Centrifugation, Density Gradient; D002501:Centrifugation, Zonal; D004267:DNA Viruses; D004269:DNA, Bacterial; D004270:DNA, Circular; D004996:Ethidium; D009690:Nucleic Acid Conformation; D010761:Phosphorus Radioisotopes; D011549:Pseudomonas
chemical_list: D004269:DNA, Bacterial; D004270:DNA, Circular; D010761:Phosphorus Radioisotopes; D004996:Ethidium