Purity: 90 % Use: invitro research and manufacture use; membrane assay, ELISA assay, FIA assay, protein /hapten binding, antibody immunization. etc. Storage: short-term: refrigerated at 2-8 ºC; long term: frozen at or below -20 ºC. Shelf Life: Six months refrigerated at 2-8ºC and two years frozen at -20 ºC or below from production date. However, it is recommended to be evaluated from time to time to assure the test performance according to your product specification. Additional Remark: Avoid multiple freeze/thaw cycles. Not for human medication use. Warnings & Precaution: Avoid multiple freeze/thaw cycles. Handle with caution due to its unknown physiological impact.