#neurotransmitter  transmits nerve impulses across a synapse
  supertype:  neurochemical  any organic substance that occurs in neural activity
  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

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