| cryo-EM | cryo-electron microscopy |
| ES | eukaryotic expansion segment |
| ETS | external transcribed spacer |
| ITS | internal transcribed spacer |
| pre-rRNA | precursor ribosomal RNA |
| RNP | Ribonucleoprotein |
| rRCS | ribosomal RNA complementary sequence |
| rRNA | ribosomal ribonucleic acid |
| scaRNA | small Cajal body RNAs |
| snoRNP | small nucleolar ribonucleoprotein |
| SSU | small subunit of the ribosome |
| Utp | U-three protein |
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