The Alexa Fluor 488 donkey anti—rabbit IgG is labeled with our bright, photostable, green-fluorescent Alexa Fluor 488 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 crossreactivity to bovine, chicken, goat, guinea pig, hamster, horse, human, mouse, rat and sheep serum proteins.