Insulin, a hormone produced in clusters of pancreatic cells called islets of Langerhans, regulates carbohydrate metabolism and allows the body to use and store glucose. Patients with diabetes have a decreased ability to either produce or absorb insulin. Canadian physiologists Charles Best and Sir Frederick Banting revolutionized the treatment of diabetes when they discovered how to isolate insulin in 1921. What happened when a 14-year-old diabetic was given the first insulin injection in 1922? Discuss (http://forum.thefreedictionary.com/postst72629_Insulin-First-Used-to-Treat-Diabetes.aspx)