projections and peptide neurotransmitter/neuromodulator content of autonomic and visceral afferent neurons of the guinea pig were studied after application of the subunit b of cholera toxin ( ctb ) with or without horseradish peroxidase ( hrp ) as retrograde and anterograde tracers and subsequent immunohistochemical processing for double staining using antibodies raised to ctb , hrp and various neuropeptides .
C0004388
autonomic
C1520026
visceral afferent neurons