Streptavidin conjugated to a range of fluorescent dyes for use in in situ hybridization and flow cytometry. High specificity reagents. Convenient: no need to label inhouse Streptavidin conjugated to Cy2, Cy3, or C5 fluorescent dyes. CyDye fluors combine exceptional photostability with bright and intense signals, resulting in high sensitivity and highly reproducible performance at a biologically suitable pH range of 3 to 10.