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Schematic representation of the Aplysia central nervous system and its 9 major ganglia including paired buccal (BG), pedal (Pe), pleural (Pl), and cerebral (CG) as well as a single abdominal (AG) ganglion; a pair of neurosecretory clusters (Bag cells – Bc) is located in the abdominal ganglion and involved in the control of egg-laying behavior. |