Store the lyophilized product at -20 degree C. Conjugate concentrate is stable for two hours after reconstitution. Once the conjugate has been diluted, use immediately. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Labeled with horseradish peroxidase (HRP). Sodium azide is a potent inhibitor of peroxidase and should not be added to HRP conjugates. HRP conjugates are sensitive to light.