title: Amplification of papovavirus defectives during serial low multiplicity infections.
mesh_terms: D001739:BK Virus / Q000235:genetics / Q000254:growth & development*; D002460:Cell Line; D003673:Defective Viruses / Q000254:growth & development*; D005814:Genes, Viral; D005910:Glioma; D011120:Polyomavirus / Q000254:growth & development*; D013539:Simian virus 40 / Q000235:genetics / Q000254:growth & development*; D014762:Viral Interference