title: Pathogenicity of some clones from field isolates of avian leukosis viruses.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D001353:Avian Leukosis; D001354:Avian Leukosis Virus / Q000276:immunology / Q000472:pathogenicity*; D002642:Chick Embryo; D002645:Chickens; D002999:Clone Cells; D005260:Female; D005354:Fibrosarcoma / Q000209:etiology; D006390:Hemangioendothelioma / Q000209:etiology; D008297:Male; D009500:Neutralization Tests; D014774:Virulence
chemical_list: D000914:Antibodies, Viral