title: Introduction to the symposium on endorphins and neurotransmitters.
mesh_terms: D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009424:Nervous System Physiological Phenomena; D009474:Neurons / Q000502:physiology; D018377:Neurotransmitter Agents / Q000502:physiology*
chemical_list: D004723:Endorphins; D018377:Neurotransmitter Agents