Predicted to enable neuropeptide hormone activity. Predicted to be involved in digestion. Predicted to be located in extracellular region. Predicted to be active in axon and extracellular space. Is expressed in Rohon-Beard neurons; brain; habenula; and trigeminal ganglion. Human ortholog(s) of this gene implicated in alcohol dependence and nicotine dependence. Orthologous to human CCK (cholecystokinin).