This secondary conjugate (molecular weight 210 kDa) recognizes YOUR human monoclonal IgM antibody. Hug-M-ZAP (IT-43) is a chemical conjugate of affinity-purified goat anti-human IgM and the ribosome-inactivating protein, saporin. Hug-M- ZAP uses your primary human monoclonal IgM antibody to target and eliminate cells and can be used to evaluate the potential of a primary antibody to internalize.