This product is prepared by labeling highly cross-adsorbed donkey anti-rat IgG (H+L) with the far-red fluorescent dye CF™640R. CF™640R is a novel rhodamine-based dye spectrally similar to Cy®5 and Alexa Fluor® 647. CF™640R is much brighter than Cy®5 and at least as bright as Alexa Fluor® 647 when excited at 633 or 635 nm. However, the most important advantage of CF™640R is its exceptional photostability. CF™640R is far more photostable than the cyanine-based dyes Cy®5 and Alexa Fluor® 647. It is also more photostable than Atto 647N, a dye that has been extensively used in single molecule-based imaging. CF™640R is also extremely water-soluble and pH-insensitive. These properties make CF™640R ideally suited for demanding applications such as confocal microscopy. Please download the CF™640R dye flyer for more details. To minimize cross-reactivity, the antibody has been adsorbed against bovine, chicken, goat, guinea pig, Syrian hamster, horse, human, mouse, rabbit, and sheep serum proteins.Compatible with the NucleoCounter® NC-3000™.