Insulin

Humulin; Iletin II; Novolin; Velosulin

The structure of insulin. The left-hand side is a space-filling model of the insulin monomer, believed to be biologically active. Carbon is green, hydrogen white, oxygen red, and nitrogen blue. On the right-hand side is a cartoon of the hexamer, believed to be the stored form. A monomer unit is highlighted with the A chain in blue and the B chain in cyan. Yellow denotes disulfide bonds, and magenta spheres are zinc ions. [[Image: ...