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| + | ====== Helix ======= | ||
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| + | A helix is formed by a polypeptide chain with repeating phi and psi angles. | ||
| + | Its geometry is defined by the number of residues per turn, and the rise per residue. | ||
| + | In principle the polypeptide chain can form right and left handed helices with | ||
| + | a range of pitches. | ||
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