1. For the ICRF Annual Report, 1979: II. Retroviruses as Mutagens: Isolation of Revertants with Deletions and/or Insertions in the ASV Provirus in B31 Cells after Superinfection with MuLV Publication: Produced: 1979 Subject(s): Avian Sarcoma VirusesDNA, ViralMutagens Archival Collection: The Harold Varmus Papers (Profiles in Science)