| Sample | Specific activity (Units mg−1 × 100) | |||
| Commercial XOR | Bovine XOR | Caprine XOR | Ovine XOR | |
| No addition | 77.0 ± 0. 4 | 13.1 ± 0.6 (125.0 ± 0.1) | 2.6 ± 0.2 | 0.6 ± 0.1 (2.7 ± 0.1) |
| NAD+ | 51.4 ± 0.2 | 8.5 ± 0.2 | 1.3 ± 0.1 | 1.1 ± 0.1 |
| FAD | ND | 12.0 ± 2.3 | 1.7 ± 1.0 | 0.5 ± 0.2 |
| NAD+/ FAD | ND | 9.0 ± 2.7 | 1.0 ± 0.3 | 1.4 ± 0.1 |