1 12 2 3 4 5 6 7 8 9 10 11 12 13 GGUAAUAAGC UC Crystallography ? ? Angstroms 1 G O3' 8.260 3.286 -11.311 2 G P 7.704 1.790 -11.068 O3' 9.045 -2.542 -9.258 3 U P 7.718 -3.349 -9.702 O3' 4.547 -4.849 -5.389 4 A P 2.975 -5.184 -5.236 O3' -0.884 -3.680 -1.224 5 A P -2.334 -4.365 -1.391 O3' -6.555 -0.763 -0.292 6 U P -8.057 -1.343 -0.348 O3' -10.237 -0.716 -6.215 7 A P -11.669 -0.862 -6.942 O3' -15.660 2.659 -5.328 8 A P -15.754 4.189 -5.836 O3' -13.598 8.595 -2.335 9 G P -12.869 10.013 -2.039 O3' -11.194 12.150 0.558 10 C P -10.709 13.267 -0.509 O3' -7.316 16.720 0.257 11 U P -7.618 17.892 -0.815 O3' -5.148 21.382 -3.277 12 C P -6.256 22.214 -4.108 O3' -5.818 22.888 -9.425 6 7 ! ! ! SG1 4 8 1 314.677 120.738 2 256.798 96.590 3 198.918 72.443 4 164.190 57.954 5 129.462 43.466 6 94.734 28.977 7 60.007 14.489 8 25.279 0.000 9 150.516 361.855 10 150.516 424.570 11 150.516 487.285 12 150.516 550.000 1 7 18 19 20 21 22 23 24 GAGUACC Crystallography ? ? Angstroms 1 G O3' -5.805 7.992 -14.135 2 A P -4.432 7.755 -13.323 O3' 0.226 9.193 -13.149 3 G P 0.953 8.632 -11.807 O3' 3.341 10.638 -7.955 4 U P 3.693 9.371 -7.018 O3' 2.308 9.721 -1.762 5 A P 2.412 8.524 -0.684 O3' 2.328 7.606 3.373 6 C P 3.903 7.503 3.719 O3' 7.114 4.300 5.371 7 C P 7.910 5.579 5.941 O3' 12.609 6.574 3.662 1 0.000 550.000 2 0.000 487.285 3 0.000 424.570 4 0.000 361.855 5 140.964 211.354 6 198.843 235.502 7 256.723 259.649 1 7 + + c 2 6 + + c 3 5 W W c 9 4 W W c 10 3 + + c 11 2 - - c 12 1 + + c 12 2 W W c 10 4 ! ! ! 1 7 3 9 4 4