title: RNA tumor viruses of pheasants: characterization of avian leukosis subgroups F and G.
mesh_terms: D001355:Alpharetrovirus / Q000145:classification* / Q000302:isolation & purification; D000818:Animals; D001717:Birds; D002459:Cell Fusion; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D002642:Chick Embryo; D003673:Defective Viruses; D004372:Ducks; D004625:Embryo, Nonmammalian; D005777:Geese; D006378:Helper Viruses; D066298:In Vitro Techniques; D009500:Neutralization Tests; D011784:Quail; D011995:Recombination, Genetic; D014762:Viral Interference