eLife assessment
This important study describes a method to decouple the mechanisms supporting pancreatic progenitor self-renewal and expansion from feed-forward mechanisms promoting their differentiation allowing in vitro expansion of hPSC-derived pancreatic progenitors. The strength of evidence is convincing in that the authors use appropriate and validated methodology in line with current state-of-the-art. The work will be of interest to the field of beta cell replacement therapy in diabetes.