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Avian leukosis virus (ALV) is the cause of a variety of tumour diseases in poultry, causing huge economic losses all over the world. As a retrovirus, its genome is highly variable and easily recombined between different subgroups. Previous studies found several recombinant events among subgroup A, B and E, but few data show that in subgroup J, which is the most prevalent and pathogenic in chickens...
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