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Pseudorotation wheel of the furanose ring and preferred conformation of ribose (top) and deoxyribose nucleotides (bottom). Each point on the circle represents a specific value of the pseudorotation angle P (8). Shaded regions indicate conformations found in A- and B-type helices. On the periphery of the cycle, riboses with signs of the endocyclic torsion angles (ν0 to ν4) are indicated (+) positive, (–) negative and (0) torsion angle at 0°.
