Cy5, when bound to Psophocarpus tetragonolobus Lectin (PTL/PTA II), can show the binding pattern of this lectin in cellular imaging and flow cytometry. The excitation wavelength required for Cy5 to fluoresce is high enough to avoid overlap with most other fluorochromes, making it useful for dual-labeling experiments. Because of this high excitation, there is typically less background from autofluorescence of biological specimens.||Source:|Winged bean||Blood Specificity:|O (-SA)||Sugar Specificity:|N-Acetylgalactosamine, Galactose||Inhibitory Carbohydrate:|N-Acetylgalactosamine||Fluorescence:|Red||Excitation:|650nm||Emission:|670nm||Storage and Stability:|May be stored at 4°C before opening. DO NOT FREEZE! Stable at 4°C as an undiluted liquid. Dilute only prior to immediate use. Stable for 6 months after receipt at 4°C. CY5 conjugates are sensitive to light