Islets were defined as groups of >20 endocrine cells56 (link)–58 (link) and smaller groups were defined as clusters. Estimation of the relative pancreatic area occupied by SYN, INS, or CHYM cells was performed as described53 (link), using a Nanozoomer Digital Pathology slide scanner (Hamamatsu; Bridgewater, New Jersey) at the Cellular and Molecular Imaging Core, DRC University of Washington, and the Visiopharm software (Hoersholm, Denmark).
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