title: Evolutionary aspects of transmitter heterogeneity.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D004447:Echinodermata; D006651:Histocytochemistry; D006801:Humans; D008959:Models, Neurological; D008974:Mollusca; D008121:Nephropidae; D009474:Neurons / Q000378:metabolism / Q000502:physiology*; D018377:Neurotransmitter Agents / Q000378:metabolism; D009435:Synaptic Transmission
chemical_list: D018377:Neurotransmitter Agents