Description_x000D_ Application_x000D_ Insulin is used as a growth factor in many mammalian cell culture systems._x000D_ Biochem/physiol Actions_x000D_ Two-chain polypeptide hormone produced by the β-cells of pancreatic islets. Its molecular weight is ~5800 Da. The α and β chains are joined by two interchain disulfide bonds. The α chain contains an intrachain disulfide bond. Insulin regulates the cellular uptake, utilization, and storage of glucose, amino acids, and fatty acids and inhibits the breakdown of glycogen, protein, and fat._x000D_ Physical form_x000D_ powder-0 °C; solution stable 2-8 °C, 1 year_x000D_ Reconstitution_x000D_ To prepare 10 mg/ml stock solution, add 10 ml of acidified H2O (pH ≤2) - prepared by addition of glacial acetic acid (approx. 0.1 ml).