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Average active site cofactor volume (n = 3 in each case) for nitrogenases computed by the CASTp server in the absence of the active site cofactor.
| Nitrogenase type | Active site volume (Å3) | Average deviation |
|---|---|---|
| NifD-A | 1701 | 178 |
| Uncharacterized | 1842 | 316 |
| NifD-B | 1931 | 113 |
| AnfD | 1198 | 351 |
| VnfD | 1015 | 168 |
