Type II diabetes is a lifestyle-related disease in which patients exhibit hyperglycaemia and insulin resistance. 1 Prolonged hyperglycaemia can lead to serious complications, such as blindness due to retinopathy, renal failure, and necrosis of the extremities. 1 Worldwide, the total number of patients with diabetes was reportedly 463 million as of 2019 by the 9th Edition of IDF Diabetes Atlas. Current treatments for type II diabetes combine diet therapy, exercise therapy, and pharmacological therapy with hypoglycaemic agents and insulin. 2 Meanwhile, a regenerative therapeutic approach of transplanting insulin-producing cells is being studied in patients with rapidly progressive severe diabetes. 3 Specifically, the transplantation of insulinproducing cells obtained through the differentiation of autologous