JULIA KAMLISH / SCIENCE PHOTO LIBRARY JULIA KAMLISH / SCIENCE PHOTO LIBRARY
Human insulin: injection bottle of Humulin-S, a short-acting, soluble type of human insulin. The pancreatic hormone insulin is crucial in the body's control of carbohydrate, fat & protein metabolism. Diabetes mellitus results from a deficiency in insulin synthesis or secretion. Insulin-dependent diabetics require repeated injections of insulin to maintain the delicate balance of glucose in their blood. Most available insulins are porcine or human-derived. Human insulins are prepared either by modification of porcine material or biosynthetically, through recombinant DNA technology using the bacterium Eschericia coli.
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