| D | | e2iv3D1 | A: Rossmann-like | X: Rossmann-related | H: S-adenosyl-L-methionine-dependent methyltransferases | T: Fer4, Fer4_7, Fer4_10 | F: | ECOD (20:10:01) |
| D | | e2iv3D2 | A: Family A G protein-coupled receptor-like | X: Family A G protein-coupled receptor-like | H: Class I glutamine amidotransferase-like | T: EryCIII-like_N | F: | ECOD (20:10:01) |
| C | | e2iv3C1 | A: Type II ABC importer transmembrane domain fold | X: Type II ABC importer transmembrane domain fold | H: Type II ABC importer transmembrane domain fold | T: Ribosomal_S30 | F: | ECOD (20:10:01) |
| C | | e2iv3C2 | A: Family A G protein-coupled receptor-like | X: Family A G protein-coupled receptor-like | H: Class I glutamine amidotransferase-like | T: EryCIII-like_N | F: | ECOD (20:10:01) |
| B | | e2iv3B1 | A: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | T: | F: | ECOD (20:10:01) |
| B | | e2iv3B2 | A: Family A G protein-coupled receptor-like | X: Family A G protein-coupled receptor-like | H: Class I glutamine amidotransferase-like | T: EryCIII-like_N | F: | ECOD (20:10:01) |
| A | | e2iv3A1 | A: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | T: Aldedh | F: | ECOD (20:10:01) |
| A | | e2iv3A2 | A: Family A G protein-coupled receptor-like | X: Family A G protein-coupled receptor-like | H: Class I glutamine amidotransferase-like | T: EryCIII-like_N | F: | ECOD (20:10:01) |