UBR2 and autoimmune pancreatitis: In 2009, Frulloni et al. [74] reported that 94% of AIP patients exhibited IgG antibodies to H. pylori plasminogen-binding protein (PBP), that is homologous to the human protein ubiquitin-protein ligase E3 component n-recognin 2 (UBR2), highly expressed in pancreatic acinar cells.