Many commonly requested modifications are available:
| Modification | 25/50 µmol | 100 µmol |
| N-terminal acetylation | No additional charge | |
| C-terminal acetylation | No additional charge | |
| PO4-Thr, PO4-Ser or PO4-Tyr | $100 | $200 |
| N-terminal biotinylation | $25 | $50 |
| Lys-Biotin (Biocytin) | $100/aa | $200/aa |
| Fluorescein | $50 | $100 |
| Rhodamine | $150 | $250 |
| Asymmetric Dimethyl-Arg | $60 | $120 |
| Non-radioactive isotopes | actual cost of labeled Fmoc aa | |
| D-amino acids | TBD | |
| Other special requests | call for pricing and availability | |
