IAPP and gastric ulcer: Meantime, the beneficial effects of several peptides (i.e., amylin [97], cholecystokinin [98,99], leptin [100], and stable gastric pentadecapeptide BPC 157 [17,101,102,103,104,105,106,107] (suggested as the acting mediator of the dopamine brain-gut axis [107])) further extended the dopamine gastric ulcer story.