All

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 D12 Amino Acids, Peptides, and Proteins D000602 +
  D12.776 Proteins D011506 +
   D12.776.543 Membrane Proteins D008565 +
    D12.776.543.750 Receptors, Cell Surface D011956 +
     D12.776.543.750.720 Receptors, Neurotransmitter D017981 +
      D12.776.543.750.720.670 Receptors, Presynaptic D017661 +
        D12.776.543.750.720.670.100 Autoreceptors D017660