Classification of each dinucleotide step in a right-handed nucleic acid structure: A-like; B-like; TA-like; intermediate of A and B, or other cases step Xp Yp Zp XpH YpH ZpH Form 1 TC/GA -3.05 8.87 0.06 -4.31 8.75 1.44 B 2 CA/TG -2.70 8.97 -0.27 -2.67 8.81 1.69 B 3 AC/GT -3.10 9.15 0.37 -5.68 9.04 1.47 B 4 CT/AG -3.69 8.98 0.46 -6.54 8.88 1.39 B 5 TT/AA -3.18 9.21 0.43 -5.30 9.06 1.70 B 6 TC/GA -2.20 9.22 0.56 -2.45 9.19 0.96 7 CA/TG -2.42 9.07 0.16 -3.09 8.80 2.18 8 AC/GT -3.01 8.95 0.53 -8.89 8.90 1.33 9 CA/TG -2.49 8.42 0.94 -2.90 8.46 0.49 10 AT/AT -3.54 8.90 0.39 -6.35 8.89 0.59 11 TG/CA --- --- --- --- --- --- --- 12 GT/AC --- --- --- --- --- --- --- 13 TC/GA -2.73 9.08 0.55 -3.34 9.04 0.98 14 CA/TG -2.80 9.03 0.04 -2.77 8.94 1.26 B 15 AC/GT -3.38 9.24 0.25 -7.90 9.03 1.98 B 16 CT/AG -3.82 8.90 0.15 -5.31 8.90 0.35 B 17 TT/AA -3.14 9.09 -0.29 -4.99 8.97 1.46 B 18 TC/GA -2.63 9.13 -0.07 -2.81 9.12 0.42 B 19 CA/TG -2.85 8.64 -0.79 -2.10 8.58 1.26 B 20 AC/GT -3.21 9.13 -0.18 -3.60 9.04 -1.31 B 21 CA/TG -3.01 8.81 0.37 -4.19 8.80 0.54 B 22 AT/AT -3.79 8.93 -0.02 -4.79 8.88 -0.92 B 23 TG/CA --- --- --- --- --- --- --- 24 GT/AC --- --- --- --- --- --- --- 25 TC/GA -3.22 8.77 -0.16 -3.51 8.76 0.54 B 26 CA/TG -3.19 8.89 -0.70 -2.12 8.91 0.49 B 27 AC/GT -3.41 9.15 0.31 -8.34 8.72 2.78 B 28 CT/AG -3.42 8.95 0.44 -6.44 8.88 1.14 B 29 TT/AA -2.95 9.34 0.28 -4.57 9.19 1.68 B 30 TC/GA -2.76 9.11 0.69 -4.79 8.82 2.37 31 CA/TG -2.42 8.92 0.37 -1.44 8.79 1.56 32 AC/GT -3.20 9.24 0.91 -6.57 9.18 1.40 33 CA/TG -3.11 8.52 0.78 -4.15 8.56 0.22 34 AT/AT -3.31 9.18 0.04 -3.92 9.11 -1.13 35 TG/CA --- --- --- --- --- --- --- 36 GT/AC --- --- --- --- --- --- --- 37 TC/GA -2.95 8.91 -0.16 -2.69 8.91 -0.18 B 38 CA/TG -2.87 9.08 -0.22 -2.24 9.07 0.48 B 39 AC/GT -3.28 9.27 0.46 -5.22 9.13 1.69 B 40 CT/AG -3.28 8.96 0.52 -5.88 8.82 1.70 41 TT/AA -2.91 9.26 0.33 -4.85 9.21 0.98 B 42 TC/GA -2.39 9.29 0.39 -3.67 9.16 1.55 B 43 CA/TG -2.81 8.86 -0.62 -1.33 8.86 0.70 B 44 AC/GT -3.38 9.22 -0.04 -4.52 9.22 -0.32 B 45 CA/TG -3.01 8.77 0.34 -3.52 8.76 -0.54 B 46 AT/AT -3.88 9.09 -0.19 -5.82 9.09 -0.20 B