| Core subunits | “Eukaryote-specific subunits” | “Metazoan-specific subunits” |
|---|
| Hsa | Ago | Hsa | Ago | Hsa | Ago |
|---|
| MT-ND1 | Nad1 | NDUFAB1 | SDAP | NDUFA3 | B9 |
| MT-ND2 | Nad2 | NDUFA1 | MWFE | NDUFA7 | B14.5a |
| MT-ND3 | Nad3 | NDUFA2 | B8 | NDUFA10 | CI-42k |
| MT-ND4 | Nad4 | NDUFA5 | B13 | NDUFB1 | n.d. |
| MT-ND4L | Nad4L | NDUFA6 | B14 | NDUFB2 | AGGG |
| MT-ND5 | Nad5 | NDUFA8 | PGIV | NDUFB4 | B15 |
| MT-ND6 | Nad6 | NDUFA9 | CI-39ka | NDUFB5 | n.d. |
| NDUFS2 | Nad7 | NDUFA11 | B14.7 | NDUFB6 | n.d. |
| NDUFS8 | Nad8 | NDUFA13 | B16.6 | NDUFB8 | ASHI |
| NDUFS3 | Nad9 | NDUFB3 | B12 | NDUFC1 | n.d. |
| NDUFS7 | Nad10 | NDUFB7 | B18 | NDUFC2 | B14.5b |
| NDUFS1 | Nad11 | NDUFB9 | B22 | NDUFV3 | n.d. |
| NDUFV1 | CI-51k | NDUFB10 | PDSW | n.d. | NUXMb |
| NDUFV2 | CI-24k | NDUFB11 | ESSS | n.d. | NUUMb |
| NDUFA12 | B17.2 | NDUFS5 | CI-15k | | |
| NDUFS4 | AQDQ | | | | |
| NDUFS6 | CI-13kA | | | | |
- Subunits shown in bold are encoded in mtDNA. n.d., not detected. A. godoyi nomenclature is based on that of bovine CI [44]
- aWe identified two distinct isoforms of this subunit in Andalucia, encoded by separate genes
- bNUXM and NUUM (identified in fungi) were initially considered to be distant homologs of the human subunits NDUFB1 and NDUFC1, respectively [48], but more recently this conclusion has been disputed [49]
