Source: Recombinant protein corresponding to aa46-217 from human FCGR2B, fused to Avi-His-Tag at C-terminal, expressed in HEK293 cells. Molecular Weight: ~23kD Storage and Stability: Aliquot to avoid repeated freezing and thawing and store at -70C. Aliquots are stable for 6 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.