Features: Suitable for use in solid-phase assays, tissue/cell staining systems, and blotting applications. Vector® Laboratories’ enzyme-conjugated avidin and streptavidin are produced with the highest specific activity enzymes in optimal ratios. Specific covalent linkages are chosen to provide stable, highly active conjugates. One unit is 1 µmole p-nitrophenylphosphate hydrolyzed per min. at 37 °C, pH 9.8.