'''Somatostatin''' inhibits the production of other hormones.
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'''Cholecystokinin''' or '''CKK''' is secreted as a hormone and is involved in [[Gut_Endocrine_Function_-_Anatomy_%26_Physiology|gastric enzyme secretion]]. CKK affects the secretion of pancreatic enzymes but also promotes feelings of satiety within the cortex of the brain following a meal. It is also involved in smooth muscle contraction within the small intestine.
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'''Somatostatin''' or '''Growth hormone-inhibiting hormone (GHIH)''' is a regulatory molecule within the endocrine system but also affects neurotransmission via it's interaction with G-protein coupled somatostain receptors. It also inhibits the production of many other secondary hormones.