All

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 B04 Viruses D014780 +
  B04.280 DNA Viruses D004267 +
   B04.280.375 Hepadnaviridae D015613 +
    B04.280.375.100 Avihepadnavirus D017917 +
     B04.280.375.100.450 Hepatitis B Virus, Duck D015611 
 B04 Viruses D014780 +
  B04.450 Hepatitis Viruses D006518 +
   B04.450.390 Hepadnaviridae D015613 +
    B04.450.390.100 Avihepadnavirus D017917 +
     B04.450.390.100.450 Hepatitis B Virus, Duck D015611 
 B04 Viruses D014780 +
  B04.909 Vertebrate Viruses D014712 +
   B04.909.204 DNA Viruses D004267 +
    B04.909.204.340 Hepadnaviridae D015613 +
     B04.909.204.340.100 Avihepadnavirus D017917 +
      B04.909.204.340.100.450 Hepatitis B Virus, Duck D015611