the plasma concentrations of neuropeptides ( neurotensin , substance p , motilin , somatostatin , vasoactive intestinal peptide and gastrin-releasing peptide ) , the urinary excretion of 5-hydroxyindoleacetic acid and serotonin , and the platelet concentration of serotonin were compared in 133 patients who could be assigned to one of four groups .
C0027895
neuropeptides
C0061132
gastrin-releasing peptide