All

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 B04 Viruses D014780 +
  B04.820 RNA Viruses D012328 +
   B04.820.650 Retroviridae D012190 +
    B04.820.650.124 Betaretrovirus D030121 +
      B04.820.650.124.500 Mammary Tumor Virus, Mouse D008324 
      B04.820.650.124.520 Mason-Pfizer monkey virus D016093 
      B04.820.650.124.600 Ovine pulmonary adenocarcinoma virus D022141 
 B04 Viruses D014780 +
  B04.909 Vertebrate Viruses D014712 +
   B04.909.574 Oncogenic Viruses D009858 +
    B04.909.574.807 Retroviridae D012190 +
     B04.909.574.807.124 Betaretrovirus D030121 +
       B04.909.574.807.124.500 Mammary Tumor Virus, Mouse D008324 
       B04.909.574.807.124.520 Mason-Pfizer monkey virus D016093 
       B04.909.574.807.124.600 Ovine pulmonary adenocarcinoma virus D022141 
 B04 Viruses D014780 +
  B04.909 Vertebrate Viruses D014712 +
   B04.909.777 RNA Viruses D012328 +
    B04.909.777.731 Retroviridae D012190 +
     B04.909.777.731.124 Betaretrovirus D030121 +
       B04.909.777.731.124.500 Mammary Tumor Virus, Mouse D008324 
       B04.909.777.731.124.520 Mason-Pfizer monkey virus D016093 
       B04.909.777.731.124.600 Ovine pulmonary adenocarcinoma virus D022141