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feline leukemia virus (FeLV) and feline sarcoma virus (FeSV) are both species of gammaretrovirus; FeLV causes leukemia, lymphosarcoma, immune deficiency, or other degenerative diseases in cats; FeSV is a recombinant feline leukemia viruses where part of the genome has been replaced by cellular oncogenes, unique to individuals and not transmitted naturally to other cats; FeSVs are replication defective and require FeLV to reproduce.
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