| Component | Amount | Final Concentration |
| Purified PCR product of step 49 | 24 μl | unknown |
| Forward primer OK1430 (10 μM) | 3 μl | 0.6 μM |
| Reverse primer OK 1432 (10 μM) | 3 μl | 0.6 μM |
| 10× Expand Buffer with MgCl2 | 5 μl | 1× |
| 10mM dNTPs | 4 μl | 0.8 mM |
| Nuclease-free water | 10.625 μl | |
| Expand Enzyme (3.5 U μl-1) | 0.375 μl | 0.02625 U μl-1 |
| Total | 50 μl | |