CCK and gallbladder disorder: Regarding protein, a recent study showed the possibility of a relationship between gluten sensitivity and the occurrence of gallbladder mucocele, characterized by reduced serum cholecystokinin and increased transglutaminase-2-IgA autoantibodies in Border Terriers with gallbladder mucoceles [134], which is in part homologous to gallbladder disease identified in human coeliac disease [135].