1 8 1 2 3 4 5 6 7 8 CCCIUGGG 4 I Crystallography ? ? Angstroms 1 C O3' 0.419 19.223 1.321 2 C P -0.178 20.247 2.403 O3' 2.263 22.591 6.337 3 C P 1.084 23.635 6.712 O3' 2.517 28.125 8.907 4 I P 1.108 28.851 9.131 O3' 1.501 33.986 9.304 5 U P -0.000 34.251 9.754 O3' -2.561 38.525 8.305 6 G P -4.100 38.516 8.778 O3' -7.841 40.344 5.979 7 G P -9.261 39.850 6.488 O3' -13.479 38.926 3.657 8 G P -14.683 38.173 4.367 O3' -18.381 35.506 2.833 1 188.571 0.000 2 188.571 78.571 3 188.571 157.143 4 188.571 235.714 5 188.571 314.286 6 188.571 392.857 7 188.571 471.429 8 188.571 550.000 1 8 9 10 11 12 13 14 15 16 CC CIUGGG 4 I Crystallography ? ? Angstroms 1 C O3' -10.343 22.335 0.448 2 C P -9.190 23.051 -0.449 O3' -10.312 26.412 -4.131 3 C P -8.790 26.683 -4.593 O3' -7.801 31.520 -6.333 4 I P -6.222 31.362 -6.630 O3' -3.512 35.651 -7.207 5 U P -2.022 35.052 -7.377 O3' 1.770 37.525 -5.779 6 G P 3.066 36.608 -5.899 O3' 7.352 36.407 -3.262 7 G P 8.243 35.122 -3.628 O3' 11.356 32.448 -0.516 8 G P 12.148 31.516 -1.557 O3' 13.732 26.690 -0.121 1 0.000 550.000 2 0.000 471.429 3 0.000 392.857 4 0.000 314.286 5 0.000 235.714 6 0.000 157.143 7 0.000 78.571 8 0.000 0.000 1 8 + + c 2 7 + + c 3 6 + + c 4 5 W W c 5 4 W W c 6 3 + + c 7 2 + + c 8 1 + + c 1 8 8