Source: Recombinant protein corresponding to aa20-263 from human IL-2RB, fused to Avi-His-Tag at C-terminal, expressed in HEK293 cells. Molecular Weight: ~28kD 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.