title: Isolation of helper viruses from preparations of hamster-specific sarcoma viruses.
mesh_terms: D000818:Animals; D000937:Antigen-Antibody Reactions; D000956:Antigens, Viral / Q000032:analysis; D002471:Cell Transformation, Neoplastic; D002478:Cells, Cultured / Q000382:microbiology; D002999:Clone Cells; D006224:Cricetinae / Q000196:embryology*; D046508:Culture Techniques; D005347:Fibroblasts / Q000382:microbiology; D017988:Gammaretrovirus / Q000276:immunology / Q000302:isolation & purification*; D006378:Helper Viruses / Q000302:isolation & purification; D008722:Methods; D008979:Moloney murine leukemia virus / Q000276:immunology; D014316:Tritium; D014529:Uridine; D014779:Virus Replication
chemical_list: D000956:Antigens, Viral; D014316:Tritium; D014529:Uridine