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Number of unique sequences in antiparallel DNA duplexes of different lengths and number of cases for which experimental data are available
| Length | No of sequences | No of experimental data | No of good sampling |
|---|---|---|---|
| Base pair dimer | 10 | 10 | 9 |
| Trimer | 32 | 31 | 9 |
| Tetramer | 136 | 83 | 9 |
| Pentamer | 512 | 128 | 5 |
The number (No. good sampling) of cases for which there are 15 or more experimental values for helical parameters is indicated.
