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Considered structural features. The secondary structure elements are split into three different groups. Hydrogen bonding and protein motions that enable HX are divided in four categories
| Hydrogen bonding | Secondary structure | Protein motions | |
|---|---|---|---|
| Information | Elements | ||
| cat. 1 | no | no | L |
| cat. 2 | Hbond with H2O | helix | UD |
| cat. 3 | Hbond with main-chain O | β-sheet | UD + EX1 |
| cat. 4 | Hbond with side-chain O | / | EX1 |
