title: Chemically coded transmitter systems.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism / Q000502:physiology*; D002450:Cell Communication; D009474:Neurons / Q000378:metabolism; D009490:Neurosecretory Systems / Q000502:physiology*; D018377:Neurotransmitter Agents / Q000378:metabolism / Q000502:physiology*
chemical_list: D018377:Neurotransmitter Agents