| ID | Fold | PDBID | PDB annotation | Length | RFam ID |
| 4K50_G | 1 | 4K50 | RNA (5'-R(P*GP*CP*CP*CP*GP*GP*AP*CP*GP*AP*GP*AP*GP*A)-3') | 14 | - |
| 4K50_J | 40 | 4K50 | RNA (33-MER) | 35 | - |
| 4K50_K | 1 | 4K50 | RNA (5'-R(P*GP*CP*CP*CP*GP*GP*AP*CP*GP*AP*GP*AP*GP*A)-3') | 14 | - |
| 4K50_N | 40 | 4K50 | RNA (33-MER) | 35 | - |
| 4K50_O | 1 | 4K50 | RNA (5'-R(P*GP*CP*CP*CP*GP*GP*AP*CP*GP*AP*GP*AP*GP*A)-3') | 14 | - |
| 4KHP_A | 56 | 4KHP | 16S Ribosomal RNA | 1506 | RF00177 |
| 4KHP_X | 66 | 4KHP | Fragment of messenger RNA | 6 | - |
| 4KJI_C | 2 | 4KJI | RsmZ-2 | 16 | - |
| 4KJI_D | 2 | 4KJI | RsmZ-2 | 16 | - |
| 4KNQ_B | 1 | 4KNQ | 5'-R(P*CP*CP*GP*CP*CP*GP*CP*CP*GP*CP*CP*GP*CP*CP*GP*CP*CP*GP*CP*G)-3' | 20 | - |
| 4KQ0_B | 1 | 4KQ0 | 5'-R(P*GP*GP*CP*GP*GP*CP*GP*GP*CP*GP*GP*CP*GP*GP*CP*GP*GP*CP*C)-3' | 19 | - |
| 4KQ0_E | 1 | 4KQ0 | 5'-R(P*GP*GP*CP*GP*GP*CP*GP*GP*CP*GP*GP*CP*GP*GP*CP*GP*GP*CP*C)-3' | 19 | - |
| 4KQY_A | 192 | 4KQY | YitJ S box/SAM-I riboswitch | 119 | RF00162 |
| 4KR2_C | 14 | 4KR2 | Gly-tRNA-CCC | 74 | RF00005 |
| 4KR3_C | 14 | 4KR3 | Gly-tRNA-CCC | 74 | RF00005 |
| 4KR6_C | 10 | 4KR6 | RNA (39-MER) | 39 | - |
| 4KR6_D | 10 | 4KR6 | RNA (39-MER) | 39 | - |
| 4KR7_M | 10 | 4KR7 | RNA (39-MER) | 39 | - |
| 4KR7_X | 10 | 4KR7 | RNA (39-MER) | 39 | - |
| 4KR9_M | 10 | 4KR9 | RNA (39-MER) | 39 | - |
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