Storage: Up to 24 months in lyophilized form at -20ºC. For best results, rehydrate just before use and use immediately after reconstitution. After rehydration, keep solution at +4ºC for up to 3 days. For longer term storage, freeze aliquots at -20ºC or -80ºC for up to 3 months. Aliquot before freezing to avoid repeated freeze-thaw cycles.