SST (Somatostatin), also known as SMST, is a peptide hormone. Naylor et al. (1983) assigned the somatostatin gene to chromosome 3 by analyzing somatic cell hybrids with a polymorphic gene probe. Yacubova and Komuro (2002) examined the effects of somatostatin in cerebellar granule cells of early postnatal mice, because these cells express all 5 types of somatostatin receptors before the initiation of their migration. Saito et al. (2005) found that somatostatin modulated the proteolytic degradation of beta-amyloid catalyzed by neprilysin both in vitro and in vivo.