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 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.644 Peptides D010455 +
   D12.644.400 Neuropeptides D009479 +
    D12.644.400.575 Opioid Peptides D018847 +
     D12.644.400.575.281 Enkephalins D004745 +
      D12.644.400.575.281.231 Enkephalin, Leucine D004743 

 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.644 Peptides D010455 +
   D12.644.468 Opioid Peptides D018847 +
    D12.644.468.281 Enkephalins D004745 +
     D12.644.468.281.231 Enkephalin, Leucine D004743 
       D12.644.468.281.231.300 Enkephalin, Leucine-2-Alanine D016308 

 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.776 Proteins D011506 +
   D12.776.641 Nerve Tissue Proteins D009419 +
    D12.776.641.650 Neuropeptides D009479 +
     D12.776.641.650.575 Opioid Peptides D018847 +
      D12.776.641.650.575.281 Enkephalins D004745 +
       D12.776.641.650.575.281.231 Enkephalin, Leucine D004743 

 D14 Neurotransmitters and Neurotransmitter Agents D018371 +
  D14.600 Neurotransmitters D009487 +
   D14.600.600 Neuropeptides D009479 +
    D14.600.600.577 Opioid Peptides D018847 +
     D14.600.600.577.281 Enkephalins D004745 +
      D14.600.600.577.281.231 Enkephalin, Leucine D004743