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| Substrate (2 mM) | Relative activity (%) | Substrate (2 mM) | Relative activity (%) |
|---|---|---|---|
| Cytidine | 100 | Uridine | 0 |
| Deoxycytidine | 110 | Adenosine | 0 |
| 5-Fluorocytidine | 81.6 | Guanosine | 0 |
| 5-fluorodeoxycytidine | 80.1 | Inosine | 0 |
| Cytosine-β-D-arabinofuranoside | 79.5 | Thymidine | 0 |
| 5-methylcytidine | 68.5 | Deoxyuridine | 0 |
| Azadeoxycytidine | 47 | Deoxyadenosine | 0 |
| 5-Iodocytidine | 15.3 | Deoxyguanosine | 0 |
| Uracil | 0 | Deoxyinosine | 0 |
| Cytosine | 0 | 6-Azauracil | 0 |
