| D | Fer4, Fer4_7, Fer4_10 | e2iv3D1 | A: alpha arrays | X: Rossmann-like | H: Rossmann-related | T: S-adenosyl-L-methionine-dependent methyltransferases | F: Fer4, Fer4_7, Fer4_10 | ECOD (v295.2) |
| D | EryCIII-like_N | e2iv3D2 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: EryCIII-like_N | ECOD (v295.2) |
| C | Ribosomal_S30 | e2iv3C1 | A: alpha arrays | X: Type II ABC importer transmembrane domain fold | H: Type II ABC importer transmembrane domain fold | T: Type II ABC importer transmembrane domain fold | F: Ribosomal_S30 | ECOD (v295.2) |
| C | EryCIII-like_N | e2iv3C2 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: EryCIII-like_N | ECOD (v295.2) |
| B | | e2iv3B1 | A: alpha arrays | X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | F: | ECOD (v295.2) |
| B | EryCIII-like_N | e2iv3B2 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: EryCIII-like_N | ECOD (v295.2) |
| A | Aldedh | e2iv3A1 | A: alpha arrays | X: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | H: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | T: Sulfite reductase hemoprotein (SiRHP), domains 2 and 4 | F: Aldedh | ECOD (v295.2) |
| A | EryCIII-like_N | e2iv3A2 | A: alpha arrays | X: putative RnfG subunit of electron transport complex | H: putative RnfG subunit of electron transport complex | T: Class I glutamine amidotransferase-like | F: EryCIII-like_N | ECOD (v295.2) |