Protein G-thiol (sulfhydryl) will form a covalent bond with maleimide containing compounds for crosslinking applications. Protein G binds a wider variety of immunoglobulins than Protein A. This is a recombinant version of the Streptococcal protein that lacks the albumin binding domain. MW: ~26 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