title: Focus assay and defectiveness of avian myeloblastosis virus.
mesh_terms: D001355:Alpharetrovirus / Q000254:growth & development; D000818:Animals; D000956:Antigens, Viral / Q000032:analysis; D001354:Avian Leukosis Virus / Q000254:growth & development*; D009189:Avian Myeloblastosis Virus / Q000254:growth & development* / Q000276:immunology; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D002642:Chick Embryo; D003673:Defective Viruses / Q000254:growth & development*; D005260:Female; D006378:Helper Viruses / Q000254:growth & development; D008264:Macrophages; D014762:Viral Interference; D014764:Viral Proteins / Q000276:immunology; D014776:Virus Cultivation; D014779:Virus Replication; D014817:Vitelline Membrane / Q000166:cytology
chemical_list: D000956:Antigens, Viral; D014764:Viral Proteins