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Immunoperoxidase labeling of transported H129 (A, B) or PRV (C) in a surgically intact rat (A) or in two rats after vagal deafferentation (B, C). The deafferentation procedure eliminated anterograde transneuronal transport of H129 from the stomach wall into the NST and higher brain regions but did not interfere with retrograde transneuronal transport of PRV. AP, Area postrema; cc, central canal; DMV, dorsal motor vagal nucleus; NST, nucleus of the solitary tract; IV, fourth ventricle.
