Human Immunoglobulin A (IgA) represents about 15% to 20% of immunoglobulins in the blood, although Human Immunoglobulin A (IgA)is primarily secreted across the mucosal tract into the stomach and intestines. This prevents microbes from binding to epithelial cells in the digestive and respiratory tracts. Human Immunoglobulin A (IgA)helps to fight against pathogens that contact the body surface, are ingested, or are inhaled. Applications: Suitable for use in ELISA, Western Blotting. Other applications not tested. Recommended Dilution: Optimal dilutions to be determined by the researcher. Storage and Stability: May be stored at 4°C for short-term only. For long-term storage and to avoid repeated freezing and thawing, aliquot and add glycerol (40-50%). Freeze at -20°C or colder. Aliquots are stable for at least 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.