Horseradish Peroxidase Avidin D (Av-HRP), Concentrate, for ELISAs and Blots, 5 mg, is optimized for use in solid-phase assays such as ELISAs 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.