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Extension threshold for proteins of 4 classes
| Protein Class | helix extension threshold | strand extension threshold |
| All alpha | 0.98 | No statistic |
| All beta | No statistic | 1.01 |
| Alpha and beta (α/β) | 1 | 1.02 |
| Alpha or beta (α+β) | 0.99 | 0.98 |
Notice that the strand extension threshold in all alpha class and the helix extension threshold in all beta class are not statistical in reference 20.
