Alexa Fluor 610—R-phycoerythrin goat anti—rabbit IgG is labeled with our tandem dye construct that excites at 488 nm and emits at 630 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.