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Secondary structure

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1dtg

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Secondary structure refers to a protein's local three-dimensional structure, for example alpha helices and beta sheets are secondary structure. The structure on the right of a human transferrin n-lobe mutant (PDB code 1dtg) is shown in cartoon backbone representation to highlight its secondary structure, with alpha-helices in magenta and beta-sheets in yellow.

For more information, see Wikipedia's page on secondary structure.

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