1. This causes RB-101 to be strongly synergistic with cholecystokinin antagonists. 2. These include serotonin, neurotensin, cholecystokinin ( CCK ), and gastrin. 3. Ceruletide is similar in action and composition to cholecystokinin . 4. It acts as a cholecystokinin antagonist, which blocks both the CCK B subtypes. 5. Pentagastrin binds to the cholecystokinin -B receptor, which is expressed widely in the brain. 6. The first hormone to be studied by Ondetti s group was cholecystokinin , a digestion hormone. 7. It is the antagonist of cholecystokinin and inhibits the pancreatic secretion which is stimulated by cholecystokinin. 8. It is the antagonist of cholecystokinin and inhibits the pancreatic secretion which is stimulated by cholecystokinin . 9. Hormones secreted include somatostatin, motilin, cholecystokinin , neurotensin, vasoactive intestinal peptide, and enteroglucagon. 10. The excitation of the vagus nerve, the administration of gastrin, secretin or cholecystokinin induce PP secretion.