part of start stage end stage digestive system enteroendocrine cell somatostatin secreting cell D cell CL:0000502 TAO:0009228 ZFA:0009228 A cell found throughout the gastrointestinal tract and in the pancreas. They secrete somatostatin in both an endocrine and paracrine manner. Somatostatin inhibits gastrin, cholecystokinin, insulin, glucagon, pancreatic enzymes, and gastric hydrochloric acid. A variety of substances which inhibit gastric acid secretion (vasoactive intestinal peptide, calcitonin gene-related peptide, cholecystokinin, beta-adrenergic agonists, and gastric inhibitory peptide) are thought to act by releasing somatostatin. D cells zebrafish_anatomy segmentation:10-13 somites adult