(C) Insulin is a peptide hormone produced by the beta cells of the pancreatic islets. It is stored in the pancreas in the form of a hexameric complex

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(C) Insulin is a peptide hormone produced by the beta cells of the pancreatic islets. It is stored in the pancreas in the form of a hexameric complex coordinated with $Zn^{2+}$ ions. Therefore,traces of $Zn$ (zinc) are essential for the structural stability and storage of insulin.