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 +
 D12.776.543.750.720.300.300 Receptors, Catecholamine D017983 +
 D12.776.543.750.720.300.300.300 Receptors, Adrenergic D011941 +
 D12.776.543.750.720.300.300.300.300 Receptors, Adrenergic, alpha D011942 +
 D12.776.543.750.720.300.300.300.300.100 Receptors, Adrenergic, alpha-1 D018340 
 D12.776.543.750.720.300.300.300.300.200 Receptors, Adrenergic, alpha-2 D018341