Figure 2

Two repeating units in a DNA dinucleotide chain. One residue (nucleotide) is defined from phosphate to phosphate. Conformation of each residue is given by six backbone torsion angles α, …, ζ, and by the glycosidic torsion angle χ. “Suite” goes from δ to δ+1 angles consisting from the following torsions: δ, ϵ, ζ, α+1, β+1, γ+1, δ+1.