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Metal contents of purified proteins and metal ratios of isolated clusters
| Sample | Metal content | Metal ratio, Fe/Mo | |
| Fe, mol metal/mol protein | Mo, mol metal/mol protein | ||
| Protein | |||
| NifENapo | 7.6 ± 1.1 | 0.03 ± 0.01 | — |
| NifENL | 16.1 ± 1.1 | 0.03 ± 0.01 | — |
| NifENM | 15.8 ± 0.6 | 1.12 ± 0.04 | — |
| NifDK | 32.3 ± 1.2 | 1.82 ± 0.10 | — |
| Cluster | |||
| M-clusterNifEN | — | — | 6.9 ± 0.4 |
| M-clusterNifDK | — | — | 7.3 ± 0.3 |
