While proteins are usually composed of linear chains of amino acids,branched chains of amino acids and internally cross-linked chains can be found in certain proteins.Polypeptide chains are most commonly linked to each other through

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Disulfide bonds are covalent bonds that commonly link polypeptide chains together, especially in proteins with multiple subunits or in the stabilization of protein tertiary and quaternary structures.

While Proteins Are Usually Composed of Linear Chains of Amino