1 21 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 GCGUCACACC GGUGAAGUCG C Crystallography ? ? Angstroms 1 G P -20.921 -39.723 41.638 O3' -25.557 -41.430 41.482 2 C P -26.730 -40.661 42.259 O3' -31.212 -41.701 45.266 3 G P -31.712 -40.212 45.562 O3' -34.369 -39.682 49.477 4 U P -34.722 -38.155 49.779 O3' -34.876 -35.090 54.620 5 C P -34.661 -33.500 54.599 O3' -32.599 -30.551 57.770 6 A P -32.975 -29.112 57.164 O3' -29.792 -25.481 58.199 7 C P -30.644 -24.253 57.620 O3' -28.358 -20.419 55.342 8 A P -29.788 -19.749 55.023 O3' -29.807 -16.898 50.652 9 C P -31.259 -16.184 50.750 O3' -33.448 -15.787 45.990 10 C P -35.008 -15.423 45.751 O3' -37.945 -16.585 41.916 11 G P -39.486 -16.195 42.247 O3' -43.695 -18.499 40.503 12 G P -44.930 -17.793 41.268 O3' -49.245 -20.440 41.918 13 U P -50.284 -19.455 42.657 O3' -53.480 -21.075 46.469 14 G P -54.182 -19.857 47.263 O3' -55.609 -20.332 52.147 15 A P -56.538 -19.033 51.943 O3' -56.203 -15.391 55.026 16 A P -54.976 -14.743 55.847 O3' -55.130 -10.838 59.815 17 G P -53.902 -10.106 59.065 O3' -50.557 -7.718 61.493 18 U P -50.584 -6.254 60.822 O3' -46.778 -3.119 60.138 19 C P -47.407 -1.800 59.455 O3' -44.810 1.167 56.275 20 G P -45.865 2.294 55.754 O3' -45.872 4.340 51.068 21 C P -47.192 5.270 51.090 O3' -50.002 6.422 46.790 SG1 6 6 SG2 15 16 1 57.391 0.000 2 57.391 23.913 3 57.391 47.826 4 57.391 71.739 5 57.391 95.652 6 57.391 119.565 7 57.391 191.304 8 57.391 215.217 9 57.391 239.130 10 57.391 263.043 11 57.391 286.957 12 57.391 310.870 13 57.391 334.783 14 57.391 358.696 15 57.391 382.609 16 57.391 430.435 17 57.391 454.348 18 57.391 478.261 19 57.391 502.174 20 57.391 526.087 21 57.391 550.000 1 21 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 GCGUCACAC CGGUGAAGUC GC Crystallography ? ? Angstroms 1 G P -59.926 -7.449 47.776 O3' -56.829 -7.079 43.565 2 C P -55.386 -7.747 43.816 O3' -51.192 -6.670 41.956 3 G P -50.319 -7.902 42.517 O3' -45.474 -6.821 43.043 4 U P -44.549 -7.954 43.668 O3' -40.606 -8.526 47.307 5 C P -40.273 -9.852 48.124 O3' -39.020 -10.681 53.481 6 A P -38.835 -12.264 53.367 O3' -39.952 -14.260 58.029 7 C P -39.639 -15.798 57.812 O3' -42.461 -19.465 59.823 8 A P -41.689 -20.732 59.177 O3' -44.456 -24.798 58.140 9 C P -43.450 -25.843 57.448 O3' -45.676 -29.338 54.066 10 C P -44.481 -30.234 53.397 O3' -44.524 -31.746 48.399 11 G P -43.096 -32.504 48.327 O3' -40.224 -31.647 43.772 12 G P -38.629 -31.949 43.743 O3' -35.737 -29.396 40.139 13 U P -34.214 -29.901 40.214 O3' -30.193 -26.905 39.199 14 G P -28.846 -27.699 39.649 O3' -24.742 -25.231 41.147 15 A P -23.758 -26.490 41.061 O3' -20.188 -27.891 44.788 16 A P -20.966 -28.298 46.107 O3' -17.212 -30.106 49.463 17 G P -18.336 -30.994 50.232 O3' -18.301 -31.245 55.236 18 U P -18.536 -32.792 55.599 O3' -20.648 -34.707 59.274 19 C P -20.402 -36.299 59.310 O3' -23.838 -40.444 60.670 20 G P -22.968 -41.724 60.270 O3' -25.658 -45.549 58.811 21 C P -24.546 -46.624 58.350 O3' -25.456 -49.961 54.813 SG1 6 6 SG2 15 16 1 0.000 550.000 2 0.000 526.087 3 0.000 502.174 4 0.000 478.261 5 0.000 454.348 6 0.000 406.522 7 0.000 358.696 8 0.000 334.783 9 0.000 310.870 10 0.000 286.957 11 0.000 263.043 12 0.000 239.130 13 0.000 215.217 14 0.000 191.304 15 0.000 167.391 16 0.000 143.478 17 0.000 95.652 18 0.000 71.739 19 0.000 47.826 20 0.000 23.913 21 0.000 0.000 1 21 + + c 2 20 + + c 3 19 + + c 5 17 + + c 7 14 + + c 8 13 - - c 9 12 + + c 10 11 + + c 11 10 + + c 12 9 + + c 13 8 - - c 14 7 + + c 17 5 + + c 19 3 + + c 20 2 + + c 21 1 + + c 4 18 ! ! ! 18 4 ! ! ! 1 21 5 7 14 8 17 5 5