For the following sequence, it has one "Q" at the peptide N terminus, which is not stable and could undergo a cyclization reaction to form pGlu. It is hard to get a qualified peptide, but if you'd like to, we can have a try. However, if the peptide is urgent for your project, you can choose one of the following to avoid such cyclization?
1) Remove "Q" from N-terminus
2) Add another amino acid in front of "Q"
3) Add N-terminus acetylation
