We were wondering how an IgM primary antibody might work in a Mab-ZAP assay. I realize that the conjugated antibody is an anti-IgG whole molecule antibody. However there may well be aspects/epitopes shared in common between IgG and IgM that might render an IgM primary useful with the Mab-ZAP reagent… or not? Has anyone looked at this with your products?
We do believe, but have not confirmed, that you will see a cross-reactivity, but at a lower level. We do sell a second immunotoxin for IgM’s, Anti-M-ZAP (Cat. #IT-30) which is made from a goat anti-murine IgM.