






                                            TABLE








                 Cartesian and cylindrical polar coordinates of atoms in a            

              base-triplet in the poly d(C). poly d(I). poly d(C) triple-             

              helix.  Successive base-triplets can be generated by adding             

              multiples of 32.7 degrees to phi and the same multiple of               

              0.316 nm to z.                                                          
1




            --------------------------------------------------------------------
             Group      Atom      x(nm)     y(nm)     z(nm)     r(nm)   phi(deg)
            --------------------------------------------------------------------


            PHOSPHATE   P        0.1455   -0.8592    0.1977    0.8714    -80.39
                        O1       0.1661   -0.9715    0.2920    0.9856    -80.30
                        O2       0.0309   -0.7703    0.2265    0.7709    -87.70
                        O3       0.1336   -0.9155    0.0484    0.9252    -81.70
                        O5       0.2798   -0.7725    0.1879    0.8216    -70.09


            SUGAR       C1       0.5301   -0.5169    0.0578    0.7404    -44.28
                        C2       0.5985   -0.5203    0.1942    0.7930    -41.00
                        C3       0.5307   -0.6405    0.2596    0.8318    -50.36
                        C4       0.5147   -0.7365    0.1416    0.8985    -55.05
                        C5       0.4032   -0.8383    0.1538    0.9302    -64.31
                        O4       0.4860   -0.6487    0.0289    0.8105    -53.16


            CYTOSINE    N1       0.4121   -0.4266    0.0522    0.5931    -45.99
                        C2       0.4366   -0.2913    0.0303    0.5248    -33.71
                        O2       0.5535   -0.2534    0.0164    0.6087    -24.60
                        N3       0.3312   -0.2057    0.0244    0.3899    -31.85
                        C4       0.2060   -0.2507    0.0397    0.3245    -50.59
                        N4       0.1035   -0.1673    0.0341    0.1967    -58.25
                        C5       0.1785   -0.3895    0.0626    0.4284    -65.38
                        C6       0.2853   -0.4733    0.0679    0.5526    -58.92


            PHOSPHATE   P        0.2375    0.9152   -0.1702    0.9455     75.45
                        O1       0.1142    0.8471   -0.2151    0.8548     82.32
                        O2       0.2809    1.0309   -0.2520    1.0685     74.76
                        O3       0.2217    0.9604   -0.0174    0.9857     77.00
                        O5       0.3573    0.8093   -0.1594    0.8847     66.18


            SUGAR       C1       0.5631    0.5249   -0.0407    0.7698     42.99
                        C2       0.6500    0.5165   -0.1660    0.8302     38.47
                        C3       0.6080    0.6431   -0.2408    0.8850     46.61
                        C4       0.5876    0.7425   -0.1267    0.9469     51.64
                        C5       0.4928    0.8574   -0.1556    0.9889     60.11
                        O4       0.5321    0.6616   -0.0191    0.8490     51.19


            INOSINE     N1       0.3378    0.0756    0.0021    0.3462     12.61
                        C2       0.4676    0.1101    0.0216    0.4804     13.25
                        N3       0.5157    0.2309    0.0077    0.5650     24.12
                        C4       0.4207    0.3191   -0.0292    0.5280     37.18
                        C5       0.2890    0.2901   -0.0501    0.4095     45.11
                        C6       0.2422    0.1555   -0.0331    0.2878     32.71
                        O6       0.1288    0.1111   -0.0477    0.1701     40.80
                        N7       0.2200    0.4034   -0.0867    0.4595     61.40
                        C8       0.3132    0.4988   -0.0867    0.5890     57.88
                        N9       0.4346    0.4499   -0.0522    0.6255     45.99


            PHOSPHATE   P       -0.7365    0.4554   -0.3581    0.8659    148.27
                        O1      -0.8279    0.5058   -0.4628    0.9702    148.58
                        O2      -0.6872    0.3171   -0.3765    0.7568    155.23
                        O3      -0.8055    0.4692   -0.2144    0.9322    149.78
                        O5      -0.6124    0.5551   -0.3428    0.8265    137.81


            SUGAR       C1      -0.3004    0.7219   -0.2057    0.7819    112.59
                        C2      -0.2716    0.7782   -0.3445    0.8242    109.24
                        C3      -0.4020    0.7472   -0.4176    0.8485    118.28
                        C4      -0.5065    0.7702   -0.3083    0.9218    123.33
                        C5      -0.6374    0.6959   -0.3254    0.9437    132.49
                        O4      -0.4411    0.7233   -0.1869    0.8472    121.38


            CYTOSINE    N1      -0.2530    0.5819   -0.1865    0.6345    113.50
                        C2      -0.1199    0.5645   -0.1507    0.5771    101.99
                        O2      -0.0481    0.6645   -0.1364    0.6662     94.14
                        N3      -0.0729    0.4384   -0.1326    0.4444     99.44
                        C4      -0.1538    0.3327   -0.1489    0.3665    114.81
                        N4      -0.1078    0.2096   -0.1312    0.2357    117.23
                        C5      -0.2915    0.3485   -0.1858    0.4543    129.91
                        C6      -0.3361    0.4755   -0.2036    0.5823    125.25


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