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| Reagents | Concentration | Relative activity |
| CuCl2 | 1.0 mM | 100% |
| EDTA | 1.0 mM | 2.36±0.10% |
| DTT | 1.0 mM | 54.75±2.51% |
| guanidine-HCl | 1.0 mM | 87.30±4.59% |
| SDS | 1.0% | 38.78±1.41% |
| o-phenanthroline | 0.1 mM | 2.71±0.06% |
The values were means ± standard deviations for triplicate assays.
