All
 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 +
 D12.776.543.750.720.300 Receptors, Biogenic Amine D017982 +
 D12.776.543.750.720.300.450 Receptors, Histamine D011968 +
 D12.776.543.750.720.300.450.300 Receptors, Histamine H1 D011969 
 D12.776.543.750.720.300.450.400 Receptors, Histamine H2 D011970 
 D12.776.543.750.720.300.450.500 Receptors, Histamine H3 D018100