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. Author manuscript; available in PMC: 2015 Dec 2.
Published in final edited form as: Phys Rev E Stat Nonlin Soft Matter Phys. 2003 Dec 31;68(6 0 1):061109. doi: 10.1103/PhysRevE.68.061109

FIG. 6.

FIG. 6

(a) The backbone of a peptide chain. The dihedral angle of the peptide bond (C-N) cannot rotate. The long curved dashed line represents a possible hydrogen bond. (b) An example of poly-alanine. The dihedral angle between Cα−Cβ can rotate.