Alexa Fluor® 647 goat anti—human IgM (µ chain) is labeled with our bright, photostable, far-red-fluorescent Alexa Fluor® 647 dye and is prepared from antibodies purified by human IgM—affinity chromatography. The antibodies react specifically with IgM heavy chains (µ chains) and not with immunoglobulin light chains. To minimize crossreactivity, it has been adsorbed human IgG prior to conjugation.