title: Replicating SV40 molecules containing closed circular template DNA strands.
mesh_terms: D002478:Cells, Cultured; D002499:Centrifugation, Density Gradient; D004261:DNA Replication / Q000187:drug effects; D004279:DNA, Viral / Q000302:isolation & purification; D003851:Deoxyribonucleases / Q000494:pharmacology; D007668:Kidney; D008854:Microscopy, Electron; D008967:Molecular Biology; D010179:Pancreas / Q000201:enzymology; D010759:Phosphorus Isotopes; D013539:Simian virus 40 / Q000302:isolation & purification; D014316:Tritium
chemical_list: D004279:DNA, Viral; D010759:Phosphorus Isotopes; D014316:Tritium; D003851:Deoxyribonucleases