![]() ![]() The chiral centers of a polypeptide chain can undergo racemization. However, proteins can become cross-linked, most commonly by disulfide bonds, and the primary structure also requires specifying the cross-linking atoms, e.g., specifying the cysteines involved in the protein's disulfide bonds. ![]() In general, polypeptides are unbranched polymers, so their primary structure can often be specified by the sequence of amino acids along their backbone.
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