Single band on polyacrylamide electrophoresis. Molecular Weight: ~28kD Quality Control: Single band on polyacrylamide electrophoresis. Storage and Stability: May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 6 months after receipt at -20C. 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. Further dilutions can be made in assay buffer, but maintain stock at 1mg/ml.