All

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 B04 Viruses D014780 +
  B04.820 RNA Viruses D012328 +
   B04.820.650 Retroviridae D012190 +
    B04.820.650.589 Lentivirus D016086 +
     B04.820.650.589.600 Lentiviruses, Ovine-Caprine D017972 +
      B04.820.650.589.600.900 Visna-maedi virus D014790 
 B04 Viruses D014780 +
  B04.909 Vertebrate Viruses D014712 +
   B04.909.777 RNA Viruses D012328 +
    B04.909.777.731 Retroviridae D012190 +
     B04.909.777.731.589 Lentivirus D016086 +
      B04.909.777.731.589.600 Lentiviruses, Ovine-Caprine D017972 +
       B04.909.777.731.589.600.900 Visna-maedi virus D014790