#neurochemical  any organic substance that occurs in neural activity
  supertype:  #organic_compound__organiccompound  any compound of carbon and another element or a radical
  subtype:  #neurotransmitter  transmits nerve impulses across a synapse
     subtype:  #epinephrine__epinephrin__adrenaline__Adrenalin  a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
     subtype:  #gamma_aminobutyric_acid__GABA  an amino acid that is found in the central nervous system; acts as an inhibitory neurotransmitter
     subtype:  #acetylcholine  a neurotransmitter that is a derivative of choline; released at the ends of nerve fibers in the somatic and parasympathetic nervous systems
  subtype:  #endorphin  a neurochemical occurring naturally in the brain and having analgesic properties
     subtype:  #enkephalin  an endorphin having opiate qualities

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