| ID | Fold | PDBID | PDB annotation | Length | RFam ID |
| 4U53_3 | 27 | 4U53 | 5S ribosomal RNA | 121 | RF00001 |
| 4U53_4 | 544 | 4U53 | 5.8S ribosomal RNA | 158 | RF00002 |
| 4U53_6 | 56 | 4U53 | 18S ribosomal RNA | 1800 | RF01960 |
| 4U53_5 | 53 | 4U53 | 25S ribosomal RNA | 3396 | RF02543 |
| 4U53_7 | 27 | 4U53 | 5S ribosomal RNA | 121 | RF00001 |
| 4U53_8 | 544 | 4U53 | 5.8S ribosomal RNA | 158 | RF00002 |
| 4U55_2 | 56 | 4U55 | 18S ribosomal RNA | 1800 | RF01960 |
| 4U55_1 | 53 | 4U55 | 25S ribosomal RNA | 3396 | RF02543 |
| 4U55_3 | 27 | 4U55 | 5S ribosomal RNA | 121 | RF00001 |
| 4U55_4 | 544 | 4U55 | 5.8S ribosomal RNA | 158 | RF00002 |
| 4U55_6 | 56 | 4U55 | 18S ribosomal RNA | 1800 | RF01960 |
| 4U55_5 | 53 | 4U55 | 25S ribosomal RNA | 3396 | RF02543 |
| 4U55_7 | 27 | 4U55 | 5S ribosomal RNA | 121 | RF00001 |
| 4U55_8 | 544 | 4U55 | 5.8S ribosomal RNA | 158 | RF00002 |
| 4U56_2 | 56 | 4U56 | 18S ribosomal RNA | 1800 | RF01960 |
| 4U56_1 | 53 | 4U56 | 25S ribosomal RNA | 3396 | RF02543 |
| 4U56_3 | 27 | 4U56 | 5S ribosomal RNA | 121 | RF00001 |
| 4U56_4 | 544 | 4U56 | 5.8S ribosomal RNA | 158 | RF00002 |
| 4U56_6 | 56 | 4U56 | 18S ribosomal RNA | 1800 | RF01960 |
| 4U56_5 | 53 | 4U56 | 25S ribosomal RNA | 3396 | RF02543 |
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