All
 B04 Viruses D014780 +
 B04.909 Vertebrate Viruses D014712 +
 B04.909.777 RNA Viruses D012328 +
 B04.909.777.731 Retroviridae D012190 +
 B04.909.777.731.070 Alpharetrovirus D001355 +
 B04.909.777.731.805 Retroviruses, Simian D015301 +
 B04.909.777.731.589 Lentivirus D016086 +
 B04.909.777.731.850 Spumavirus D016092 
 B04.909.777.731.200 Deltaretrovirus D017977 +
 B04.909.777.731.375 Gammaretrovirus D017988 +
 B04.909.777.731.250 Endogenous Retroviruses D020077 
 B04.909.777.731.124 Betaretrovirus D030121 +
 B04.909.777.731.260 Epsilonretrovirus D030283