1 8 1 2 3 4 5 6 7 8 GCAGUGGC Crystallography ? ? Angstroms 1 G O3' -13.495 -12.154 0.368 2 C P -13.748 -10.599 0.668 O3' -11.045 -7.925 4.946 3 A P -10.455 -6.427 5.032 O3' -5.392 -5.875 7.555 4 G P -4.590 -4.514 7.785 O3' 1.213 -4.783 7.253 5 U P 2.379 -3.720 7.525 O3' 6.542 -2.243 4.656 6 G P 7.252 -0.885 5.104 O3' 8.522 3.271 2.639 7 G P 8.604 4.655 3.409 O3' 7.960 9.911 2.086 8 C P 9.317 9.950 2.928 O3' 8.217 6.627 6.143 SG1 1 1 SG2 8 8 1 212.903 0.000 2 212.903 53.226 3 212.903 141.935 4 212.903 230.645 5 212.903 319.355 6 212.903 408.065 7 212.903 496.774 8 212.903 550.000 1 8 101 102 103 104 105 106 107 108 GC CAcugc 5 DC 6 DT 7 DG 8 DC Crystallography ? ? Angstroms 1 G O3' -8.341 12.457 4.960 2 C P -8.794 11.210 4.081 O3' -7.400 10.532 -1.217 3 C P -7.546 9.101 -1.936 O3' -4.693 7.177 -5.857 4 A P -4.834 5.603 -6.113 O3' -0.683 2.704 -8.223 5 c P -1.217 1.246 -8.604 O3' 2.785 -2.676 -7.538 6 u P 2.569 -4.263 -7.516 O3' 4.138 -7.556 -4.047 7 g P 3.809 -9.099 -4.289 O3' 3.657 -11.535 1.176 8 c P 4.947 -12.250 1.801 O3' 2.669 -17.520 3.479 SG1 1 1 SG2 8 8 1 0.000 550.000 2 0.000 496.774 3 0.000 408.065 4 0.000 319.355 5 0.000 230.645 6 0.000 141.935 7 0.000 53.226 8 0.000 0.000 2 7 + + c 3 6 - - c 4 5 + + c 5 4 - - c 6 3 + + c 7 2 + + c 8 1 ! ! ! 2 7 6