Recombinant version of a Staphylococcal protein which binds to a variety of antibodies. MW: ~48 kDa. Keep frozen for long-term storage. Avoid repeated freeze/thaw cycles. Larger quantities are available at substantial savings. For additional details, please visit www.proteinmods.com. Product is shipped FedEx overnight on ice packs within continental US. The first item is $30, additional items are shipped at no additional shipping costs.