Store at 4C for short term. For long term storage, store at -20C on dry atmosphere.After reconstitution with 100 uL of sterile water, store at -20C. Centrifuge to remove any insoluble material. Or at 2-8C with an appropriate antibacterial agent. Glycerol (1:1) may be added for an additional stability. Aliquot to avoid repeated freezing and thawing.