The Alexa Fluor 633 goat anti—human IgG is labeled with our bright far-red—fluorescent Alexa Fluor 633 dye and is prepared from affinity-purified antibodies that react with IgG heavy chains and all classes of immunoglobulin light chains from human. To minimize crossreactivity, it has been adsorbed against mouse, rabbit and bovine serum prior to conjugation.