| HED | Homing-endonuclease domain |
| 3Rs | replication, repair and recombination |
| BIL | bacterial intein-like |
| SRR | sterol recognition region |
| DTT | dithiothreitol |
| NTPase | nucleotide tri-phosphotases |
| β-ME | beta-Mercaptoethanol |
| NCL | native chemical ligation |
| EPL | expressed protein ligation |
| PTS | protein trans-synthesis |
| CDB | chitin-binding domain |