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Dual immunoperoxidase labeling of cFos protein (blue/black nuclear label) and cytoplasmic DbH (brown label) within the caudal visceral NST. This section was taken from a rat perfused with fixative 60 min after intraperitoneal administration of cholecystokinin octapeptide (100 μg/kg body wt) to stimulate vagal sensory inputs to the NST. Arrows point out activated (i.e., cFos-positive) A2 neurons (see Refs. 210 and 213).
