title: Multiple length rings of phi-X174 and S13 replicative forms. 3. A possible intermediate in recombination.
mesh_terms: D001435:Bacteriophages / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D002701:Chloramphenicol / Q000494:pharmacology; D004926:Escherichia coli; D005827:Genetics, Microbial; D008854:Microscopy, Electron; D010759:Phosphorus Isotopes; D011995:Recombination, Genetic; D014461:Ultracentrifugation
chemical_list: D010759:Phosphorus Isotopes; D002701:Chloramphenicol