| Initial step: | 3 min | 95°C | (denaturation) |
| 25 cycles: | 30 s | 95°C | (denaturation) |
| 30 s | 50-65°C* | (annealing) | |
| 1 min/kb** | 72°C** | (extension) | |
| Final step: | 5 min | 72°C | (extension). |
The annealing temperature will depend on the melting temperature of the primers (see, e.g., https://www.sigmaaldrich.com/technical-documents/articles/biology/oligosmelting-temp.html). For best results, set up multiple PCRs at different melting temperatures and choose one that provides a single clean band on the gel.
If the plasmid is >10 kb, increase extension time to 2 min/kb and reduce temperature to 68°C.