to study the distribution of intrinsic peptidergic nerves in the gut of piebald mice and their normal littermates , we used specific radioimmunoassays to measure the tissue concentrations of the following immunoreactive neuropeptides : vasoactive intestinal peptide ( vip ) , peptide histidine-isoleucine ( phi ) , [ met ] enkephalin ( enk ) , substance p ( sp ) , and bombesin-like intestinal peptide ( blip ) .
C0027895
neuropeptides
C0030947
peptide histidine-isoleucine