Avidin D, Fluorescein labeled, is made from our highly purified Avidin D by a special labeling technique. This product has a high fluorochrome to protein ratio and is the reagent we recommend for routine immunofluorescence applications. Compared to conventional primary and secondary fluorescent labeling techniques, Fluorescein Avidin D can provide greater sensitivity and lower background staining. (For even higher sensitivity and specific applications, see Fluorescein Avidin DCS.) Excitation at 495 nm Emission at 515 nm Color