The secretin-glucagon family of gut hormones includes all of the following structurally related peptides EXCEPT:
A. Somatostatin (SST)Peptide hormones produced by enteroendocrine cells of the intestine are grouped into families based on their amino acid structural similarity. The secretin-glucagon family of hormones includes glucose-dependent insulinotropic polypeptide (GIP), glucagon-like peptide-1 (GLP-1), vasoactive intestinal polypeptide (VIP), peptide histidine isoleucine (PHI), growth hormone-releasing hormone (GHRH), and pituitary adenylyl cyclase-activating peptide (PACAP).