the immunoreactive neuropeptides demonstrated included vasoactive intestinal polypeptide ( vip ) , peptide histidine isoleucine ( phi ) , gastrin-releasing peptide ( grp ) , substance p ( sp ) , enkephalin , somatostatin , cholecystokinin , and neuropeptide y ( npy ) .
C0027895
neuropeptides
C0027893
neuropeptide y