Insulin has 3 disulfide bonds Insulinhas 2 short polypeptide chains, and 3 disulfide bonds.Two disulfides form between the two chains. A third disulfide is within Chain A. Chain A is colored light blue and chain B is colored light green. The sulfurs of the cysteines are colored yellow. Notice the precise geometry of a disulfide bond. The structure of 2Zn pig insulin crystals at 1.5 A resolution.
(PubMed) 4ins (PDB)
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