Alkaline Phosphatase Conjugated Affinity Purified anti-Rabbit IgG can be stored vial at 4 ˚C before opening. DO NOT FREEZE. This product is stable at 4 ˚C as an undiluted liquid. Dilute only prior to immediate use. Freezing alkaline phosphatase conjugates will result in a substantial loss of enzymatic activity. Expiration date is one (1) year from date of opening product.