in the present study , we used the combined retrograde fluorescence-immunofluorescence method to determine whether the cna projection to the pbn contains any of the following neuropeptides : corticotropin-releasing factor ( crf ) , neurotensin ( nt ) , somatostatin ( ss ) , and enkephalin ( enk ) .
C0027895
neuropeptides
C0027930
neurotensin