1 9 1 2 3 4 5 6 7 8 9 CGACUCAGG Crystallography ? ? Angstroms 1 C O3' -10.448 8.792 2.503 2 G P -10.466 7.663 1.352 O3' -7.248 7.722 -3.495 3 A P -6.537 6.598 -4.403 O3' -2.540 7.376 -7.670 4 C P -2.677 5.997 -8.491 O3' 2.354 3.718 -8.794 5 U P 1.645 2.580 -9.686 O3' 5.253 -0.945 -9.280 6 C P 5.770 -2.466 -9.386 O3' 8.288 -5.450 -6.624 7 A P 7.634 -6.828 -7.145 O3' 8.583 -11.181 -4.097 8 G P 8.047 -12.496 -4.859 O3' 4.356 -15.951 -1.901 9 G P 3.464 -17.149 -2.504 O3' -0.675 -19.099 -0.177 1 0.000 0.000 2 0.000 68.750 3 0.000 137.500 4 0.000 206.250 5 0.000 275.000 6 0.000 343.750 7 0.000 412.500 8 0.000 481.250 9 0.000 550.000 1 9 10 11 12 13 14 15 16 17 18 C CUGCGUCG Crystallography ? ? Angstroms 1 C O3' -10.917 -6.369 -0.659 2 C P -10.383 -5.412 0.522 O3' -6.606 -6.751 4.834 3 U P -5.705 -5.680 5.635 O3' -1.151 -8.199 7.876 4 G P -0.408 -7.296 8.977 O3' 4.576 -4.615 8.528 5 C P 4.470 -3.429 9.609 O3' 8.657 -0.707 7.239 6 G P 8.786 0.828 7.710 O3' 11.499 3.681 4.220 7 U P 11.668 5.121 4.923 O3' 9.527 9.452 2.286 8 C P 9.021 10.922 2.704 O3' 6.296 15.339 -0.420 9 G P 6.790 16.757 0.165 O3' 1.944 19.533 1.404 1 165.000 550.000 2 165.000 481.250 3 165.000 412.500 4 165.000 343.750 5 165.000 275.000 6 165.000 206.250 7 165.000 137.500 8 165.000 68.750 9 165.000 0.000 1 9 + + c 2 8 + + c 3 7 - - c 4 6 + + c 6 4 + + c 7 3 - - c 8 2 + + c 9 1 + + c 5 5 ! ! ! 1 9 9