| ID | Fold | PDBID | PDB annotation | Length | RFam ID |
| 4U38_E | 1 | 4U38 | RNA (5'-R(*UP*AP*GP*CP*UP*CP*C)-3') | 7 | - |
| 4U38_F | 1 | 4U38 | RNA (5'-R(*GP*GP*UP*GP*CP*UP*A)-3') | 7 | - |
| 4U38_G | 1 | 4U38 | RNA (5'-R(*UP*AP*GP*CP*UP*CP*C)-3') | 7 | - |
| 4U38_H | 1 | 4U38 | RNA (5'-R(*GP*GP*UP*GP*CP*UP*A)-3') | 7 | - |
| 4U3L_A | 1 | 4U3L | RNA (5'-R(*UP*CP*GP*UP*AP*CP*GP*A)-3') | 8 | - |
| 4U3L_B | 1 | 4U3L | RNA (5'-R(*UP*CP*GP*UP*AP*CP*GP*A)-3') | 8 | - |
| 4U3M_2 | 56 | 4U3M | 18S rRNA | 1800 | RF01960 |
| 4U3M_1 | 53 | 4U3M | 25s rRNA | 3396 | RF02543 |
| 4U3M_3 | 27 | 4U3M | 5.8s rRNA | 121 | RF00001 |
| 4U3M_4 | 544 | 4U3M | 5.8s rRNA | 158 | RF00002 |
| 4U3M_6 | 56 | 4U3M | 18S rRNA | 1800 | RF01960 |
| 4U3M_5 | 53 | 4U3M | 25s rRNA | 3396 | RF02543 |
| 4U3M_7 | 27 | 4U3M | 5.8s rRNA | 121 | RF00001 |
| 4U3M_8 | 544 | 4U3M | 5.8s rRNA | 158 | RF00002 |
| 4U3N_2 | 56 | 4U3N | 18S ribosomal RNA | 1800 | RF01960 |
| 4U3N_1 | 53 | 4U3N | 25S ribosomal RNA | 3396 | RF02543 |
| 4U3N_3 | 27 | 4U3N | 5S ribosomal RNA | 121 | RF00001 |
| 4U3N_4 | 544 | 4U3N | 5.8S ribosomal RNA | 158 | RF00002 |
| 4U3N_6 | 56 | 4U3N | 18S ribosomal RNA | 1800 | RF01960 |
| 4U3N_5 | 53 | 4U3N | 25S ribosomal RNA | 3396 | RF02543 |
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