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Proteins are essential macromolecules in living organisms, and their biological activity is highly dependent on their three-dimensional structure. Proteins have four levels of structural organization: primary, secondary, tertiary, and quaternary. The secondary and tertiary structures play a significant role in determining the protein’s function. The secondary structure of a protein refers _________ __________ _________ _______ _______ ______ ____ __________ __________ ___ ___ ___.
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