the root (no rank)
Viruses (domain)
retroid viruses (subkingdom)
Retroviridae (family)
Orthoretrovirinae (subfamily)
Gammaretrovirus (genus)
porcine endogenous retrovirus (species)
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porcine endogenous retrovirus C/A (subspecies)
porcine endogenous retrovirus E (subspecies)
porcine endogenous type C retrovirus (subspecies)