the root (no rank)
Viruses (domain)
retroid viruses (subkingdom)
Retroviridae (family)
Orthoretrovirinae (subfamily)
Alpharetrovirus (genus)
avian sarcoma virus (species)
[hide inferior taxa]
avian sarcoma virus 17 (subspecies)
avian sarcoma virus CT10 (subspecies)
avian sarcoma virus PR2257 (subspecies)
avian sarcoma virus PRCII (subspecies)
avian sarcoma virus S1 (subspecies)
avian sarcoma virus S2 (subspecies)
avian sarcoma virus UR2 (subspecies)
avian sarcoma virus Y73 (subspecies)
Fujinami sarcoma virus (subspecies)
Rous sarcoma virus (subspecies)