DyLight® fluorophores have absorption maxima covering the entire visible light spectrum (350 nm to 777 nm), as well several key near-infrared and infrared wavelengths. Both the absorption and emission properties of the DyLight® fluorophores match the excitation and detection wavelengths of common fluorescence instrumentation used for immunocytochemistry, immunohistochemistry, and flow cytometry. The DyLight® fluorophores exhibit higher fluorescence intensity and photostability than Alexa Fluor, CyDye and LI-COR Dyes in many applications and remain highly fluorescent over a broad pH range (pH 4-9). Additionally, the water solubility of the DyLight® fluorophores allows a high dye-to-protein ratio to be achieved without causing precipitation of conjugates. These favorable properties and high anisotropy value, as well as a high cross-section for two-photon excitation, make these fluorophores attractive as fluorescent probes in a variety of fluorescence methods.