Alexa Fluor 680—allophycocyanin goat anti—rabbit IgG is labeled with our tandem dye construct that excites at 650 nm and emits at 702 nm, and is prepared from affinity-purified antibodies that react with IgG heavy chains and all classes of immunoglobulin light chains from rabbit. To minimize crossreactivity, it has been adsorbed against human IgG, human serum, mouse IgG, mouse serum and bovine serum.