KRT19 and alkaline phosphatase measurement: To further assess whether acinar cells contribute to ductal cells during pancreatitis, we injected caerulein intraperitoneally to Tnni3-Dre;CK19-CreER;IR1 mice to induce acute pancreatitis (AP), and collected pancreatic tissues 48 h (the acute pancreatitis phase) after injury for analysis (Fig. 6a).