Molecular computer graphics representation of insulin in its hexameric form. A single insulin molecule is made up of two chains of amino acids, the so-called A & B chains, which are held together by disulphide bridges. Here, yellow & green ribbons represent the amino acids that comprise the A & B chains. The central green sphere represents a zinc atom. Insulin is stored in granules within the B cells of the pancreas, in the form of crystals consisting of 2 atoms of zinc and 6 molecules of insulin.
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