| Architecture | Description | Class | n° Families | Structure |
|---|---|---|---|---|
| pseudoknot_simple | RNAs with simple pseudoknot | structured_simple | 41 | |
| 3H | RNAs with three hairpin substructures | structured_simple | 121 | |
| 2H | RNAs with two hairpin substructures | structured_simple | 543 | |
| tRNA-like | RNAs structurally resembling tRNAs | structured_simple | 15 | |
| 3WJ | RNAs with three way junction | structured_simple | 173 | |
| hairpin | RNAs with single hairpin | structured_simple | 1309 | |
| 4H | RNAs with four hairpin substructures | structured_simple | 55 | |
| 4WJ | RNAs with four way junction | structured_simple | 47 |