PerCP-Cy™5.5, a blue laser-excitable tandem dye with emission maximum at 692 nm (far red), well fits to other fluorochromes for blue laser, such as FITC, Alexa Fluor® 488 or PE. This relatively bright fluorochrome is suitable for less abundant antigens. There is no spectral overlap into the PE channel, however, cross-laser compensation is required in the APC channel.