Islet cell transplantation has already shown improved control of glucose levels and the potential to achieve insulin independence in type 1 diabetes mellitus, however there is a shortage of organ donors needed to match patient needs [1–2]. In the search for alternative sources of islets, many cell types have shown signs of β-cell differentiation by secreting c-peptide, insulin, and glucagon [3–5]. When maintained in serum-free medium, human epithelial-like pancreatic adenocarcinoma (PANC-1) cells and human-islet derived precursor cells (hIPCs) can go through a morphological transition and cluster [6]. These islet-like cell aggregates subsequently express glucagon, somatostatin, and insulin, indicating that clustering may play an important role in differentiation towards β-cells [7].

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