The Alexa Fluor 680 donkey anti - rabbit IgG is labeled with our bright, photostable, far-red-fluorescent Alexa Fluor 680 dye and is prepared from affinity-purified antibodies that react with IgG heavy chains and all classes of immunoglobulin light chains from rabbit. The donkey anti - rabbit IgG antibodies show minimum cross-reactivity to bovine, chicken, goat, guinea pig, hamster, horse, human, mouse, rat, and sheep serum proteins.