3 10
3 different types of helices. - 3 10 helix: 3 residues per turn, 2.0 Å rise per turn, occurs only in short segments - a helix: 3.6 residues per turn, 1.5 Å rise per turn, abundant p helix: 4.3 residues per turn, 1.1 Å rise per turn, hypothetical. 3 10. a. p.
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