Source: Recombinant protein corresponding to aa39-193 from human CD70, fused to His-Avi-Tag at C-terminal, expressed in HEK293 cells. Molecular Weight: ~20kD 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.a