title: Detection of biologically defective molecules in component I of polyoma virus DNA.
mesh_terms: D000818:Animals; D002499:Centrifugation, Density Gradient; D046508:Culture Techniques; D003588:Cytopathogenic Effect, Viral; D004279:DNA, Viral / Q000032:analysis*; D003673:Defective Viruses / Q000472:pathogenicity; D004622:Embryo, Mammalian / Q000166:cytology; D006863:Hydrogen-Ion Concentration; D051379:Mice; D009691:Nucleic Acid Denaturation; D011120:Polyomavirus / Q000472:pathogenicity*
chemical_list: D004279:DNA, Viral