title: Circular DNA's from HeLa cell nuclei and mitochondria.
mesh_terms: D001965:Bromides; D002467:Cell Nucleus / Q000032:analysis*; D002499:Centrifugation, Density Gradient; D004247:DNA / Q000032:analysis*; D006367:HeLa Cells / Q000032:analysis*; D008854:Microscopy, Electron; D008928:Mitochondria / Q000032:analysis*; D010617:Phenanthridines; D013395:Sucrose
chemical_list: D001965:Bromides; D010617:Phenanthridines; D013395:Sucrose; D004247:DNA