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Pancreatic islet cells normally secrete insulin in response to high levels of glucose in the blood to maintain steady levels. Type 1 diabetes is an autoimmune disease in which the insulin secreting islet cells are destroyed. Administering insulin is life-saving but does not truly mimic the body's natural response to blood glucose and can result in serious complications such as diabetic retinopathy, nephropathy and neuropathy... Geron Corporation's Press Release -