as a first step toward assessing the status of brain neuropeptide systems that may be involved in alzheimer 's disease ( ad ) , the cerebrospinal fluid ( csf ) concentrations of the neuropeptides arginine vasopressin , somatostatin , oxytocin , and beta-endorphin were measured in patients with ad , normal elderly subjects , and normal young subjects .
C0006104
brain
C0086045
concentrations