1. The cells that produce insulin are called the Islets of Langerhans . 2. Insulin is produced by the pancreas in a region called Islets of Langerhans . 3. They also inhibit glucagon release from the alpha cells of the islets of Langerhans . 4. The islets of Langerhans was discovered in 1869 by an anatomist named Paul Langerhans. 5. Within the islets of Langerhans , beta cells constitute 65 80 % of all the cells. 6. In the islets of Langerhans , there are beta-cells, which are responsible for production of insulin. 7. The encoded protein plays an important role in the embryogenesis of pancreatic islets of Langerhans . 8. Insulin is produced exclusively by the beta cells in the islets of Langerhans in the pancreas. 9. In mammals, insulin is synthesized in the pancreas within the ?-cells of the islets of Langerhans . 10. The better alternative : Doctors will routinely implant healthy islet of Langerhans cells into the pancreas.