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 D14 Neurotransmitters and Neurotransmitter Agents D018371 +
  D14.100 Neurotransmitter Agents D018377 +
   D14.100.375 Histamine Agents D018494 +
     D14.100.375.425 Histamine Antagonists D006633 +
     D14.100.375.400 Histamine Agonists D017442 

 D27 Chemical Actions and Uses D020164 +
  D27.505 Pharmacologic Actions D020228 +
   D27.505.519 Molecular Mechanisms of Action D045504 +
    D27.505.519.625 Neurotransmitter Agents D018377 +
     D27.505.519.625.375 Histamine Agents D018494 +
       D27.505.519.625.375.425 Histamine Antagonists D006633 +
       D27.505.519.625.375.400 Histamine Agonists D017442 

 D27 Chemical Actions and Uses D020164 +
  D27.505 Pharmacologic Actions D020228 +
   D27.505.696 Physiological Effects of Drugs D045505 +
    D27.505.696.577 Neurotransmitter Agents D018377 +
     D27.505.696.577.375 Histamine Agents D018494 +
       D27.505.696.577.375.425 Histamine Antagonists D006633 +
       D27.505.696.577.375.400 Histamine Agonists D017442