title: The non-producer cell activation test in avian leukosis virus assay.
mesh_terms: D001355:Alpharetrovirus / Q000302:isolation & purification*; D000818:Animals; D002471:Cell Transformation, Neoplastic; D002642:Chick Embryo; D046508:Culture Techniques; D003673:Defective Viruses; D004372:Ducks; D005347:Fibroblasts; D006378:Helper Viruses; D008722:Methods; D001357:Sarcoma, Avian / Q000382:microbiology; D014779:Virus Replication