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| Strain | Protein | Anion | Nitrate uptake ± se (nmol NO3 min− 1 mg− 1) |
| nrtB110 | NrtA | None | 10.6 ± 1.4 |
| Formate | 8.1 ± 0.4 | ||
| Oxalate | 9.7 ± 0.4 | ||
| Carbonic acid/bicarbonate | 11.1 ± 0.4 | ||
| nrtA747 | NrtB | None | 2.9 ± 0.1 |
| Formate | 2.7 ± 0.1 | ||
| Oxalate | 2.4 ± 0.1 | ||
| Carbonic acid/bicarbonate | 2.7 ± 0.1 | ||
| Malonate | 2.7 ± 0.2 |
