| Component | Amount per reaction (μl) | Final concentration |
| Mixture prepared from step 2.2 | 38 | |
| 5x nucleotide buffer (from kit) | 9.2 | |
| Cy3-dUTP (1 mM) | 0.8 | 16 μM |
| Klenow (from kit) | 2 |
| Component | Amount per reaction (μl) | Final concentration |
| Mixture prepared from step 2.2 | 38 | |
| 5x nucleotide buffer (from kit) | 9.2 | |
| Cy3-dUTP (1 mM) | 0.8 | 16 μM |
| Klenow (from kit) | 2 |