| FNR | Fumarate and Nitrate reductase Regulatory (also NarR, NnrR and FnrP) |
| UQ | Ubiquinone |
| NAD+ | Nicotinamide adenine dinucleotide |
| FAD+ | Flavin adenine dinucleotide |
| ATP | Adenosine triphosphate |
| Cyt. c | Cytochrome c |
| Nar | Nitrate reductase (NarGHI, NapAB and NasA are also different nitrate reductases) |
| Nir | Nitrite reductase (NirS and NiK are different nitrite reductases) |
| Nor | Nitric oxide reductase |
| Nos | Nitrous oxide reductase |
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