All

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 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.776 Proteins D011506 +
   D12.776.964 Viral Proteins D014764 +
    D12.776.964.970 Viral Structural Proteins D015678 +
     D12.776.964.970.880 Viral Envelope Proteins D014759 +
      D12.776.964.970.880.350 HN Protein D015707 
 D24 Immunologic and Biological Factors D007151 +
  D24.611 Immunologic Factors D007155 +
   D24.611.216 Antigens D000941 +
    D24.611.216.327 Antigens, Viral D000956 +
     D24.611.216.327.461 Hemagglutinins, Viral D006389 +
      D24.611.216.327.461.350 HN Protein D015707