Lyophilized powder may be stored at -20 degree C. Reconstitute to nominal volume (50ul) by adding sterile 25% glycerol and store at -20 degree C. May be stored at 4 degree C for short-term only. Reconstituted product is stable for 12 months at -20 degree C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.