| ID | Fold | PDBID | PDB annotation | Length | RFam ID |
| 4U26_BB | 27 | 4U26 | 5S rRNA | 119 | RF00001 |
| 4U26_CA | 56 | 4U26 | 16S rRNA | 1539 | RF00177 |
| 4U26_DA | 53 | 4U26 | 23S rRNA | 2903 | RF02541 |
| 4U26_DB | 27 | 4U26 | 5S rRNA | 119 | RF00001 |
| 4U27_AA | 56 | 4U27 | 16S rRNA | 1539 | RF00177 |
| 4U27_BA | 53 | 4U27 | 23S rRNA | 2903 | RF02541 |
| 4U27_BB | 27 | 4U27 | 5S rRNA | 119 | RF00001 |
| 4U27_CA | 56 | 4U27 | 16S rRNA | 1539 | RF00177 |
| 4U27_DA | 53 | 4U27 | 23S rRNA | 2903 | RF02541 |
| 4U27_DB | 27 | 4U27 | 5S rRNA | 119 | RF00001 |
| 4U34_A | 1 | 4U34 | RNA (5'-R(*UP*AP*GP*CP*(SUR)P*CP*C-3') | 7 | - |
| 4U34_B | 1 | 4U34 | RNA (5'-R(*GP*GP*AP*GP*CP*UP*A)-3') | 7 | - |
| 4U35_A | 1 | 4U35 | RNA (5'-R(*UP*AP*GP*CP*(SUR)P*CP*C-3') | 7 | - |
| 4U35_B | 1 | 4U35 | RNA (5'-R(*GP*GP*UP*GP*CP*UP*A)-3') | 7 | - |
| 4U37_A | 1 | 4U37 | RNA (5'-R(*UP*AP*GP*CP*UP*CP*C)-3') | 7 | - |
| 4U37_B | 1 | 4U37 | RNA (5'-R(*GP*GP*AP*GP*CP*UP*A)-3') | 7 | - |
| 4U38_A | 1 | 4U38 | RNA (5'-R(*UP*AP*GP*CP*UP*CP*C)-3') | 7 | - |
| 4U38_B | 207 | 4U38 | RNA (5'-R(*GP*GP*UP*GP*CP*UP*A)-3') | 7 | - |
| 4U38_C | 1 | 4U38 | RNA (5'-R(*UP*AP*GP*CP*UP*CP*C)-3') | 7 | - |
| 4U38_D | 207 | 4U38 | RNA (5'-R(*GP*GP*UP*GP*CP*UP*A)-3') | 7 | - |
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