title: Introduction: comparative neurobiology of peptidergic systems.
mesh_terms: D000109:Acetylcholine / Q000502:physiology; D000818:Animals; D000242:Cyclic AMP / Q000502:physiology; D006152:Cyclic GMP / Q000502:physiology; D005728:Ganglia, Sympathetic / Q000502:physiology; D007987:Gonadotropin-Releasing Hormone / Q000502:physiology; D009419:Nerve Tissue Proteins / Q000502:physiology; D018377:Neurotransmitter Agents / Q000502:physiology*; D010455:Peptides / Q000502:physiology*; D010750:Phosphoproteins / Q000502:physiology; D009435:Synaptic Transmission
chemical_list: D009419:Nerve Tissue Proteins; D018377:Neurotransmitter Agents; D010455:Peptides; D010750:Phosphoproteins; D007987:Gonadotropin-Releasing Hormone; D000242:Cyclic AMP; D006152:Cyclic GMP; D000109:Acetylcholine