| A | | e4cyiA1 | A: a/b three-layered sandwiches | X: Lipocalins/Streptavidin | H: Fibronectin type I module-like | T: Fibronectin type I module | F: | ECOD (v294.1) |
| B | MG1 | e4cyiB2 | A: a/b three-layered sandwiches | X: Alpha-beta plaits | H: Pseudouridine synthase | T: Pseudouridine synthase | F: MG1 | ECOD (v294.1) |
| C | MG1 | e4cyiC1 | A: a/b three-layered sandwiches | X: Alpha-beta plaits | H: Pseudouridine synthase | T: Pseudouridine synthase | F: MG1 | ECOD (v294.1) |
| D | zf-CW | e4cyiD2 | A: a/b three-layered sandwiches | X: Periplasmic binding protein-like II | H: Hairpin loop containing domain-like | T: ACT-like | F: zf-CW | ECOD (v294.1) |
| E | MG1 | e4cyiE2 | A: a/b three-layered sandwiches | X: Alpha-beta plaits | H: Pseudouridine synthase | T: Pseudouridine synthase | F: MG1 | ECOD (v294.1) |
| F | MG1 | e4cyiF2 | A: a/b three-layered sandwiches | X: Alpha-beta plaits | H: Pseudouridine synthase | T: Pseudouridine synthase | F: MG1 | ECOD (v294.1) |
| G | MG1 | e4cyiG1 | A: a/b three-layered sandwiches | X: Alpha-beta plaits | H: Pseudouridine synthase | T: Pseudouridine synthase | F: MG1 | ECOD (v294.1) |
| H | MG1 | e4cyiH2 | A: a/b three-layered sandwiches | X: Alpha-beta plaits | H: Pseudouridine synthase | T: Pseudouridine synthase | F: MG1 | ECOD (v294.1) |