An amino acid residue (other than glycine) has no symmetry elements. The general operation of conversion of one residue of a single chain into a second residue equivalent to the first is accordingly a rotation about an axis accompanied by translation along the axis. Hence the only configurations for a chain compatible with our postulate of equivalence of the residues are helical configurations. ✨ Linus Pauling, Barclay Kamb (2001). Linus Pauling: Selected Scientific Papers, p.983, World Scientific

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