Goat anti-human IgM (µ chain), FITC (fluorescein-5-isothiocyanate) conjugated, is a F(ab) '2 fragment of a secondary antibody which binds to human IgM in immunological assays. FITC has Amax = 494 nm, Emax = 518 nm. Fluor to protein ratio is 3-7 moles FITC per mole antibody. Antibodies are adsorbed against human IgG or IgA and affinity purified using solid phase human IgM. F(ab)'2 fragment