The monkey IgM ELISA kit is designed for measurement of IgM in old world monkey serum or plasma . The assay uses goat anti - monkey IgM for solid phase (microtiter wells) immobilization and horseradish peroxidase (HRP) conjugated goat anti - monkey IgM antibodies for detection. Both capture and detection ant ibo dies were cross - absorbed on monkey Ig G and IgA agarose columns , thereby ensuring specificity for IgM . Cross - reactivit y with immunoglobulins from other species has not been investigated.