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Overview of the insulin molecule, its delivery platforms, and complications associated with diabetes. (A) Insulin is released into the bloodstream from the β-cells of the pancreatic islets of Langerhans. (B) Lateral and anteroposterior ocular view in a case of diabetic retinopathy. (C) Foot ulcer found in diabetic patients. (D) Capillary blood glucose measurement (glycosimetry). (E, F) Insulin administration by (E) insulin pen and (F) subcutaneous injection.
