title: Characteristics of two new avian tumor virus subgroups.
mesh_terms: D001355:Alpharetrovirus / Q000145:classification* / Q000276:immunology; D000818:Animals; D000941:Antigens; D001354:Avian Leukosis Virus; D001358:Avian Sarcoma Viruses; D001717:Birds; D002460:Cell Line; D002642:Chick Embryo; D002645:Chickens; D006224:Cricetinae; D004372:Ducks; D005347:Fibroblasts; D007106:Immune Sera; D009500:Neutralization Tests; D012526:Satellite Viruses; D014762:Viral Interference
chemical_list: D000941:Antigens; D007106:Immune Sera