title: A constraint on synaptic action in Aplysia: implications for nervous system organization.
mesh_terms: D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D001048:Aplysia / Q000502:physiology*; D002794:Choline / Q000378:metabolism; D009046:Motor Neurons / Q000502:physiology; D009424:Nervous System Physiological Phenomena; D009474:Neurons / Q000502:physiology; D011950:Receptors, Cholinergic / Q000502:physiology; D013569:Synapses / Q000502:physiology*
chemical_list: D011950:Receptors, Cholinergic; D002794:Choline; D000109:Acetylcholine