We use a variety of tags for purification - including His-Tag, S-Tag, T7-tag, Flag peptide, Thioredoxin, His-patch thioredoxin, Lac Z, Trp E, MBP, avidin-streptavidin, GST to name a few. For inquiring about other possibilities please This email address is being protected from spambots. You need JavaScript enabled to view it.