| Component | Amount (μL) | Final concentration |
| DNA from step 45 | 34 | - |
| 10X NEB Buffer 2 | 5 | 1X |
| 1mM dATP | 10 | 200 μM |
| NEB Klenow exo- | 1 | 5 U |
| Total | 50 |
| Component | Amount (μL) | Final concentration |
| DNA from step 45 | 34 | - |
| 10X NEB Buffer 2 | 5 | 1X |
| 1mM dATP | 10 | 200 μM |
| NEB Klenow exo- | 1 | 5 U |
| Total | 50 |