All

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 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.072 Amino Acids, Cyclic D000598 +
    D12.125.072.050 Amino Acids, Aromatic D024322 +
     D12.125.072.050.850 Tryptophan D014364 
       D12.125.072.050.850.479 5-Hydroxytryptophan D006916 
 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.125 Amino Acids D000596 +
   D12.125.142 Amino Acids, Essential D000601 +
    D12.125.142.875 Tryptophan D014364