title: Evidence for the vertical transmission of 'non-infectious' avian leukosis virus in 'leukosis-free' chickens.
mesh_terms: D001355:Alpharetrovirus / Q000145:classification / Q000276:immunology* / Q000302:isolation & purification; D000818:Animals; D000956:Antigens, Viral / Q000032:analysis / Q000145:classification; D001353:Avian Leukosis / Q000635:transmission*; D002642:Chick Embryo; D002645:Chickens; D003168:Complement Fixation Tests; D006224:Cricetinae / Q000276:immunology; D046508:Culture Techniques; D003851:Deoxyribonucleases; D006378:Helper Viruses; D006358:Hot Temperature; D007106:Immune Sera; D008099:Liver / Q000276:immunology / Q000382:microbiology / Q000648:ultrastructure; D008854:Microscopy, Electron; D009500:Neutralization Tests; D010179:Pancreas / Q000648:ultrastructure; D011784:Quail; D012260:Ribonucleases; D014461:Ultracentrifugation
chemical_list: D000956:Antigens, Viral; D007106:Immune Sera; D003851:Deoxyribonucleases; D012260:Ribonucleases