ALDH1A1 and chronic pancreatitis: We thus examined human specimens and found that, similar to the murine pancreas, human chronic pancreatitis exhibited regenerative metaplasia and proliferating ductal cells which would be the immediate progeny of the pancreatic stem/progenitor cells [32,35] {Rovira, 2010 #96}also showed high levels of ALDH1A1 expression (Figure 1A).