| Component | Volume per reaction (μl) | Final concentration or amount |
|---|---|---|
| 10× reaction buffer | 5 μl | 1 × reaction buffer |
| vector plasmid from step 8 (variable concentration) | variable | 1–5 μg |
| each restriction enzyme | variable | 2–5 units/ μg of DNA |
| (10–20 × 103 units/ml) | ||
| ddH2O | variable | To a final volume of 50 μl |